- Robots.txt Generator & ValidatorBuild crawl rules and check which path Googlebot can access.
- XML Sitemap GeneratorTurn page URLs and crawl metadata into a ready-to-use sitemap.xml.
- Hreflang GeneratorAdd each localized URL and get a complete hreflang set with x-default.
- Canonical Tag CheckerEnter a page URL to find its canonical and compare it with the page address.
- Redirect Rule GeneratorTurn source and destination CSV mappings into 301 or 302 rules for Nginx, Apache and Vercel.
- 46 more tools · View more→
- Schema Markup GeneratorFill in FAQ, product or how-to details and copy ready-to-paste JSON-LD.
- Podcast RSS ValidatorPaste podcast RSS XML and get a fix list for XML, channel, episode, audio enclosure, and date problems.
- RSS Feed ValidatorPaste RSS 2.0 or Atom 1.0 XML to see the format, parsed entry fields, missing requirements, and link references that need fixing.
- VCard GeneratorCreate a vCard 3.0 or 4.0 contact file from a name, phone, email and address, then download the checked .vcf file.
- Email Signature GeneratorBuild a responsive email signature from your name, role, contact details and links, then copy the HTML.
- Calendar Event Link GeneratorFill in one event and get ready-to-open Google and Outlook links plus a downloadable ICS file.
- Social Bio Character CounterCheck a profile bio against current limits for Instagram, TikTok, X, Threads and Bluesky.
- URL Slug GeneratorTurn page titles into clean, hyphenated URL slugs.
- APK Info ViewerSee what an Android app package declares — version, permissions, components, and signing certificates — before you install it.
- SQL FormatterBeautify SQL and read it back clause by clause in plain English.
- HTML Beautifier & MinifierReindent tangled HTML to read it, or minify it to ship it — with an optional check for broken tags.
- CSS Beautifier & MinifierReindent messy CSS to read it, or minify it to ship it — with a safe mode that never reorders your rules.
- JavaScript Beautifier & MinifierReindent minified or obfuscated JavaScript so you can read it, or minify your own code to ship it smaller.
- SVG OptimizerClean up SVG code and shrink it without changing the graphic.
- Webcam TestCheck your camera’s live preview, resolution, and frame rate.
- Regex TesterTest JavaScript regular expressions against sample text, right in your browser.
- XPath TesterTest XPath expressions against XML or HTML and inspect every matching node, value and path.
- JSONPath TesterTest JSONPath expressions against JSON and see matching values and paths as you type.
- Cron Expression ParserParse a cron schedule into a plain field breakdown and preview its next run times, right in your browser.
- JWT DecoderDecode JWT headers and payloads instantly, right in your browser.
- Base64 Encoder/DecoderEncode and decode Base64 text instantly, right in your browser.
- Base64 Image ConverterDrag in an image to get its Base64 data URI, or paste Base64 to preview and download the image.
- Binary/Hex ConverterConvert numbers between binary, hex, decimal, and octal — or turn text into bytes.
- URL Encoder/Decoder + HTML EntitiesEncode URLs, decode percent escapes, and escape HTML entities.
- Privacy Policy Checklist GeneratorMap what your site collects, uses and shares, then turn gaps into a policy review checklist.
- Hash GeneratorGenerate SHA-1, SHA-256, SHA-384 and SHA-512 hashes instantly, right in your browser.
- File Hash & Checksum CalculatorGet MD5, SHA-1, SHA-256, and SHA-512 for any file, and verify a checksum.
- UUID / ULID / NanoID GeneratorGenerate UUID v4, UUID v7, ULID, and NanoID values instantly, right in your browser.
- QR Code GeneratorCreate static QR codes for links, WiFi, contacts, email, SMS and text.
- QR Code ReaderScan or upload a photo to decode any QR code, right in your browser.
- Barcode GeneratorMake scannable Code 128, EAN, UPC and more barcodes to download as PNG or SVG.
- Password / Passphrase GeneratorGenerate strong random passwords or memorable passphrases, right in your browser.
- Robots Crawl Budget EstimatorCompare crawl demand with a server-safe daily capacity estimate.
- HTTP Redirect Trace ToolTurn pasted redirect headers or URL chains into a hop-by-hop trace with loop, downgrade and target warnings.
- IPv4 Subnet CalculatorEnter an IP and CIDR or subnet mask to get the network, usable range, broadcast address and host counts.
- WebSocket Test ClientConnect to a WebSocket, send messages, and view sent and received messages, connection status, the WebSocket close code, and the close reason provided by the server.
- Webhook Request InspectorPaste a webhook method, headers and body to inspect the request and build a copyable test command.
- Punycode ConverterConvert Unicode domains to Punycode and decode xn-- labels back.
- CORS CheckerCheck whether a pasted response allows a specific browser origin, method and request headers.
- DNS Propagation CheckerPaste DNS answers from multiple resolvers and compare record types, TTLs and values side by side.
- What Is My IPSee the public IP address this connection is using, with the network, region and edge details visible from it.
- SPF Record CheckerPaste an SPF TXT record to break down its terms, estimate DNS lookups and spot syntax or policy risks.
- DKIM Record CheckerPaste a DKIM TXT record to inspect its version, key type, public key, services and quoted DNS chunks.
- DMARC Record CheckerParse a DMARC TXT record to review policies, alignment, report addresses, percentages and invalid tags.
- Email Deliverability ChecklistReview your sending domain, authentication and sending practices, then get missing items and verification steps.
- TLS Cipher Suite CheckerPaste a TLS scan or handshake summary to explain the negotiated protocol, cipher suite and legacy algorithms.
Hey bro, every online tool you need is heresteady, fast, safe, useful
Use focused tools for formatting data, editing images, converting files, checking text, and handling everyday calculations without breaking your flow.
Tools
Search the catalog, open a tool, paste or drop your input, and leave with a copyable result.
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- JSON FormatterFormat, validate and minify JSON instantly.
- XML Formatter / ValidatorFormat, minify and check XML structure in your browser.
- YAML / JSON / TOML ConverterConvert YAML, JSON and TOML without leaving the page.
- Aircraft Mode S Code DecoderTurn a six-digit Mode S hex address into its ICAO allocation block, bit prefix, range and block position.
- International Sports Country Code DecoderDecode any Olympic, FIFA or ISO country code — or search a team name — and see all three systems side by side.
- 14 more tools · View more→
- Global Phone Formatter & Geolocation CheckerFormat a phone number, check its published length and prefix rules, and see any public allocation area.
- Global Bank Identifier LookupCheck a BIC/SWIFT format, read each code segment and look for an exact institution match in a dated open reference snapshot.
- Text / JSON DiffCompare text or JSON side by side and spot exactly what changed.
- Container Number CheckerBreak an ISO 6346 container number into owner code, equipment category and serial, and verify its check digit as you type.
- ISO Language Code ExplorerSearch the complete dated ISO 639 reference by code or language name, then trace how Set 1, Set 2 and Set 3 relate.
- Word CounterCount words, characters, sentences, paragraphs and reading time.
- Text Case ConverterSwitch text between uppercase, lowercase, title case and sentence case.
- Text Line SorterSort pasted lines alphabetically, numerically or by length.
- Text DeduplicatorRemove duplicate lines while keeping first occurrence order.
- Coin FlipCustomize both sides, flip once or in batches, and follow the running split, streaks and ordered history.
- DOI Citation GeneratorTurn a DOI and the article details into a ready-to-paste citation in seven styles.
- HTML Tag StripperRemove HTML tags and extract clean plain text.
- Decision Matrix BuilderScore options against weighted criteria and watch the ranking, weight shares and flip points update as you type.
- CSV / JSON / Excel ConverterConvert CSV, JSON and XLSX table files in your browser.
- Color ConverterConvert colors between HEX, RGB, HSL, HSV, CMYK and LAB — edit any field and the rest update as you go.
- Contrast CheckerEnter a text and background color to see the WCAG contrast ratio and which AA and AAA levels pass.
- Box Shadow GeneratorDrag sliders to shape a box-shadow, stack layers for depth, and copy the finished CSS instantly.
- Gradient GeneratorBuild a linear, radial, or conic gradient, add color stops and set the direction, then copy the CSS in one click.
- Border Radius GeneratorRound each corner with sliders, shape organic blobs with the elliptical mode, and copy the CSS instantly.
- 8 more tools · View more→
- Flexbox GeneratorSet up a flex container and its items with visual controls, watch the layout react live, and copy the CSS in one click.
- CSS Grid GeneratorSet your columns and rows, drag across the cells to place items, and copy the grid CSS with matching HTML in one click.
- CSS Cubic Bezier GeneratorDrag the two handles to shape an easing curve, watch a dot ride it against a steady one, and copy the cubic-bezier() value.
- CSS clamp() CalculatorEnter a size for small and large screens and get a fluid clamp() value that scales smoothly in between — for font sizes, padding, margins or gaps.
- Pixel / DPI ConverterConvert pixels to inches, cm and mm at any DPI/PPI — for screen design and print work alike.
- Screen PPI CalculatorEnter a resolution and screen size to get pixel density, dot pitch, physical dimensions and more.
- px to rem & em ConverterConvert between px, rem and em using your own root and context font sizes — edit any field and the other two update as you type.
- Font License & Info CheckerOpen a local font to read its embedded names, license text and document-embedding flags — as file evidence, not proof that you hold a license.
- Image CompressorMake JPEG, PNG and WebP files smaller in your browser, at the same pixel size.
- Image ResizerResize images by pixels, percentage or ready-made presets — one image or a whole batch.
- Image CropperCrop, rotate and flip an image to any shape — free rectangle, locked ratio, or a clean circle.
- Image WatermarkStamp a text or logo watermark onto one photo or a whole batch.
- Favicon GeneratorTurn one PNG, JPG or SVG into favicon.ico and every icon size your site needs, packed into a ZIP.
- 4 more tools · View more→
- Image Format ConverterConvert JPG, PNG, WebP, HEIC and AVIF images in your browser.
- Image Color PickerPick any pixel from an image and read its HEX, RGB and HSL, with a magnifier for precise sampling.
- Background RemoverRemove an image background automatically and download a clean transparent PNG.
- AI Alt Text GeneratorTurn any image into clear, SEO-friendly alt text — edit the wording, then copy it.
- Chord FinderIdentify chords from note names or a six-string guitar fingering, with intervals and inversions.
- Audio ConverterConvert MP3, WAV, OGG, FLAC and M4A audio files in your browser.
- YouTube Chapter GeneratorBuild a clean, valid chapter list for your YouTube video description.
- Subtitle Time Shift ToolMove every SRT or VTT cue earlier or later without rewriting subtitle text or settings.
- MOV to MP4 ConverterTurn iPhone MOV videos into MP4 instantly — no re-encoding needed.
- 4 more tools · View more→
- Extract Audio from VideoPull the audio track out of a video file and save it as MP3 or WAV, right in your browser.
- Video to GIFTurn a video clip into a looping animated GIF, right in your browser.
- Audio Waveform ViewerSee, play, zoom and select precise moments in an audio file.
- Media Metadata ViewerDrop a video or audio file to read its format, codecs, resolution, bitrate, duration and more.
- PDF Merge & SplitCombine PDFs, split every page, or extract page ranges.
- PDF Image ConverterTurn images into a PDF, or export PDF pages as PNG or JPG.
- Markdown to PDFWrite Markdown, preview it styled, and export a real PDF.
- Markdown to Word / HTMLConvert Markdown into a Word document or clean HTML.
- Book Spine Width CalculatorEstimate a book spine from page count and printer-supplied PPI or sheet thickness.
- 1 more tools · View more→
- Graph Paper GeneratorDesign custom graph paper with your grid, colors and margins, then download it true to size.
- Fourier Series CalculatorEnter a periodic function or up to five pieces to calculate Fourier coefficients, inspect the partial sum, and compare the reconstruction.
- Z-Score & Standard Deviation CalculatorPaste a data set to get its mean, standard deviation and per-value z-scores, or solve z = (x − μ) / σ for one unknown with normal-curve probabilities.
- Significant Figures CalculatorCount the significant figures in any value, round to a chosen precision, or evaluate + − × ÷ expressions with the rounding rules shown step by step.
- Linear Regression CalculatorFit a least-squares line to paired data and read its slope, R², p-value, confidence intervals, residuals and predictions in one place.
- Survey Weighting CalculatorRake respondent data to known population margins, then inspect every final weight, target residual and effective sample size.
- 12 more tools · View more→
- Quadratic Equation CalculatorSolve ax² + bx + c = 0 from three coefficients or from the whole equation, with exact and decimal answers.
- Polynomial Root SolverFind every real and complex root of a polynomial from an expanded expression or coefficient list, with residuals and convergence checks.
- Percentage CalculatorWhat is X% of a number, what percent one value is of another, the whole behind a known percentage, the rise or fall between two figures, and sale prices after a discount — all on one page.
- Boolean Algebra SimplifierReduce any Boolean expression to its minimal sum of products and product of sums, with every prime implicant and a row-by-row truth table check.
- Prime Factorization CalculatorBreak any whole number into its prime factors and see the factor tree behind it.
- Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, with exact results.
- Scientific Notation ConverterConvert standard numbers, scientific notation and engineering notation in one exact view.
- Decimal to Fraction ConverterTurn finite decimals and repeating decimals like 1.2(34) into the simplest exact fraction.
- Fraction to Decimal ConverterTurn fractions and mixed numbers like 1/8 or 2 1/4 into exact decimals.
- Roman Numeral ConverterConvert Arabic numbers and Roman numerals both ways, with strict standard notation.
- Ratio CalculatorSimplify a ratio, solve the blank in a proportion, or scale both sides by the same factor.
- Aspect Ratio CalculatorTurn any width × height into a clean ratio like 16:9, or pick a ratio and complete the missing side — for video, photos and screens alike.
- Compound Interest CalculatorSee how a starting amount and regular deposits grow with compound interest — set your rate, term and how often it compounds to get the future balance and the interest earned.
- Loan Amortization CalculatorWork out the monthly payment on a fixed-rate loan and see how every payment splits between principal and interest — with the total interest and a full repayment schedule.
- Auto Loan CalculatorBuild the full vehicle deal from price, down payment, trade-in, tax and fees, then see the monthly payment, total interest, formula and repayment schedule.
- Mortgage CalculatorEnter a home price, down payment, interest rate and term — then add property tax and insurance — to see your full monthly payment and the interest you’ll pay over the life of the loan.
- Rental Property Cash Flow CalculatorReconcile rent, vacancy, operating costs, financing and optional tax assumptions to see monthly and annual cash flow, key ratios, formulas and income scenarios.
- 12 more tools · View more→
- APR & APY ConverterTurn a nominal annual rate (APR) into its effective yield (APY) — or work back the other way — for any compounding frequency, and see the rate per period plus how much compounding adds.
- ROI & Payback CalculatorEnter what you put in and the profit it earns each period to see how long it takes to break even and your annual return on investment.
- Net Present Value CalculatorBuild a cash-flow timeline, choose the discount rate, period and tax treatment, then trace every amount into its present value and compare rate scenarios.
- Break-Even CalculatorEnter your fixed costs, price per unit and variable cost per unit to see how many units — and how much in sales — you need to cover your costs.
- Markup & Margin CalculatorEnter a cost and selling price — or set a target markup or margin — to find the profit and convert between both rates.
- CPM, CPC & CTR CalculatorAudit campaign spend, impressions and clicks, or translate CPC and CPM through an expected CTR — with formula substitutions and adjustable scenarios.
- Invoice GeneratorBuild an itemized invoice draft with live totals, your chosen tax rate and a clean print-ready preview.
- Salary to Hourly CalculatorEnter annual or monthly salary, weekly hours and work weeks to see hourly, daily and weekly pay.
- VAT, GST & Sales Tax CalculatorAdd tax to a net amount or extract the net amount and tax from a tax-inclusive total.
- Import Duty & Tax CalculatorSee what customs will add before your parcel ships — duty, import VAT or GST, and the total you actually pay on arrival.
- Amazon FBA Profit CalculatorSee your real profit per unit — every Amazon fee itemized before you commit to a product.
- Currency ConverterConvert between 30 major world currencies using European Central Bank reference rates, updated daily.
- Age CalculatorEnter a birth date to see the exact age in years, months and days — today or on any date you choose.
- Date Difference CalculatorPick two dates to see how far apart they are — in days, weeks, months and years at once.
- Date CalculatorAdd or subtract days, weeks, months or years from any date and see exactly where you land.
- Business Days CalculatorCount working days between two dates, or jump ahead N business days — weekends and the holidays you list are skipped automatically.
- Week Number CalculatorSee the ISO week number of any date with the week’s Monday-to-Sunday range — or look a week number up in reverse.
- 3 more tools · View more→
- Weekday CalculatorPick any date to see its weekday, ISO week, day of year, leap-year status and weekend check.
- Unix Timestamp ConverterConvert Unix timestamps to dates and back, instantly in your browser.
- Time Zone ConverterConvert a time from one city to another and compare it across several cities at once.
- Unit ConverterConvert length, weight, temperature, area, volume and speed between any units, instantly.
- Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin — pick a direction and get an instant result.
- Data Storage ConverterConvert between bytes, KB, MB, GB, TB and their binary units (KiB, MiB, GiB) instantly.
- Data Rate ConverterConvert between Mbps, MB/s, Gbps, Kbps and other data transfer rate units.
- Paper Weight ConverterConvert paper weight between g/m², US pounds for every grade, and Japanese ream weight, and see the same sheet written out in all of them.
- Center of Mass CalculatorList what each piece weighs and where it sits, and see the balance point with the weighted sum behind every axis.
- Blackbody Radiation CalculatorEnter a temperature — or a measured peak wavelength — and read off where the thermal spectrum peaks, how much power it radiates, and the Planck curve behind it.
- Doppler Effect CalculatorChoose the medium, set the source and the observer in motion, and get the shifted frequency with the pass-by and the wavefronts drawn in.
- Telescope FOV CalculatorExact field of view from your camera sensor and focal length, framed to scale against the Moon and deep-sky objects.
- Collision LabSet two balls in motion in one or two dimensions, choose how bouncy the impact is, and watch velocity, momentum and kinetic energy before and after they collide.
- 22 more tools · View more→
- Monitor Test SuiteCheck any screen with fullscreen test patterns — dead pixels, backlight bleed, banding, gamma, ghosting, refresh rate and more.
- Arrhenius Rate CalculatorCalculate a rate constant, recover activation energy from two measurements, or project a known rate constant to another temperature with every substitution shown.
- Nernst Equation CalculatorCalculate an electrode or cell potential from E°, temperature and Q, or build Q species by species with every contribution and substitution shown.
- Chemical Equation BalancerFind the smallest whole-number coefficients, then verify every element and explicit charge on both sides.
- Chromatography Resolution CalculatorEnter two peaks’ retention times and widths — or the column’s dead time, retention times and plate count — and get the resolution Rs, the separation verdict, and the named formula with your numbers substituted.
- DNA RNA Sequence ConverterConvert DNA to RNA or back to DNA — coding or template strand, ambiguity codes kept.
- DNA Reverse ComplementReverse, complement or reverse-complement a DNA or RNA sequence — ambiguity codes and letter case preserved.
- Ohm's Law CalculatorEnter any two of voltage, current, resistance or power, and get the other two worked out instantly.
- Transmission Line Impedance CalculatorEnter the line, its load and the frequency, and read the impedance at the input, the VSWR and the standing wave along the line, with every substitution shown.
- ADC Resolution CalculatorEnter an ADC’s bits and reference voltage to get its step size, quantization error and ideal SNR, convert between volts and codes, and follow every substitution.
- Network Latency Bandwidth CalculatorEnter a link rate, round-trip time and transfer size to see a single TCP flow’s real ceiling — with the bottleneck named, the transfer time and every substitution.
- Feeds & Speeds CalculatorPick the workpiece material, cutter diameter and flute count to get the spindle speed and feed rate to program — with chip-thinning and spindle-limit corrections worked out step by step.
- Gear Ratio CalculatorBuild a one- to six-stage external gear train and trace its ratio, shaft speed, direction, torque, efficiency losses and design-torque check from input to output.
- Taper Angle CalculatorTurn two diameters and a length into the half angle, taper ratio and taper per foot — or solve backwards for a missing dimension.
- Bernoulli Equation CalculatorBalance pressure, speed, elevation, pump head, turbine head and losses between two flow sections, with units and every energy term shown.
- Population Genetics Drift SimulatorFollow reproducible Wright–Fisher allele-frequency paths and compare fixation, loss, and remaining variation across repeated populations.
- Green Building Certification LookupChoose a certification path and target level to see its scoring threshold, mandatory requirement structure and project scope.
- Road Superelevation CalculatorSize the banking for a road curve from its speed and radius — with the friction check, minimum radius, advisory speed and transition lengths.
- Concrete Volume CalculatorBuild a pour schedule from rectangular, solid round and hollow round sections, then see net volume, ordering allowance, unit conversions and every substituted formula.
- Earthquake Epicenter Triangulation CalculatorFit an earthquake epicenter from three to eight stations using latitude, longitude and S−P intervals, with spherical distances, residuals and timing uncertainty.
- Pipe Slope CalculatorSolve pipe grade, total fall or horizontal run, convert the result into field units, and check it against a clearly identified project or 2024 IPC reference slope.
- Plant Growing Degree Days CalculatorTurn daily minimum and maximum temperatures into an auditable daily and seasonal heat total, with crop thresholds, units and every adjustment shown.
- BMR & TDEE CalculatorSee how many calories your body burns at rest and over the whole day, from your weight, height, age and activity.
- Pediatric Dose Unit ConverterConvert a dose that a clinician already set between mcg, mg, g, mL and more — with every step of the math shown.
- Pregnancy Due Date CalculatorEstimate your due date from your last period, a conception date, an IVF transfer or an ultrasound — with the formula and every step shown.
- Sleep Cycle CalculatorTime your night around complete 90-minute sleep cycles, so the alarm catches you in light sleep instead of deep sleep.
- VO₂ Max CalculatorTurn a Cooper 12-minute run or Rockport 1-mile walk into a VO₂ max estimate, with the formula, working and study range in view.
- 2 more tools · View more→
- PHQ-2 Depression ScreeningAnswer the two public PHQ-2 questions for the past two weeks, total the 0–6 score and read what the common follow-up threshold does — and does not — mean.
- Incidence & Prevalence CalculatorTurn case counts and populations into cumulative incidence, person-time incidence rate and point prevalence — with the denominator behind every measure in plain view.
- Music Tempo Delay CalculatorConvert BPM and rhythmic note values into delay times and cycle rates, with a complete timing table.
- Citation Style ConverterFormat known source details as an in-text citation and reference without filling in facts you did not provide.
- Arithmetic Worksheet GeneratorBuild a reproducible addition, subtraction, multiplication or division worksheet with a separate answer page.
- Syllable CounterCount syllables by word and line, with uncertain results marked for review.
- Population Pyramid GeneratorTurn age and sex counts into an interactive population pyramid with dependency ratios, median age, and a shape reading.
- IPIP Big Five Personality Test
- Housing Affordability Index Calculator
- Genealogy Relationship Calculator
- IPIP Big Five Personality TestRate 50 short statements and see how you describe yourself across the five major personality traits — openness, conscientiousness, extraversion, agreeableness and emotional stability.
- Housing Affordability Index CalculatorCompare household income with the income needed for a median-priced home, see the full monthly cost and audit how the index changes with the rate and down payment.
- Genealogy Relationship CalculatorTurn two paths to the same nearest common ancestor into a clear family relationship and a traceable derivation.
- Voting Method ComparatorRun one ranked-ballot scenario through five counting rules and see exactly why the winners differ.
- Recipe ScalerDouble, halve or resize a recipe to any serving count. Every quantity comes out in cooking-friendly fractions, and the ingredients that don’t scale linearly get flagged.
- Paint Coverage CalculatorTurn measured walls, coats and label coverage into whole packages, spare paint and an estimated cost.
- CS2 eDPI CalculatorEnter your mouse DPI and CS2 sensitivity to see your eDPI and the distance for a full 360° turn.
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Questions
Short answers about pricing, privacy, and choosing the right utility.
01.Are the tools free?
Yes. The tools listed here are free to open and use for everyday work. If a tool has size or usage limits, the page says so before you start.
02.Do my files get uploaded?
Most tools process text and files on your device. When a tool needs a secure service, its page says so clearly before you use it.
03.How do I find the right tool?
Search for a format or task, or open a category. Tool pages include examples, limits, related tools, and copy or download controls.