All tools
23 tools — Converters, generators and calculators that run entirely inside your browser. Nothing is uploaded, nothing is stored, and none of it needs an account.
Image tools
3 tools- Image ConverterConvert PNG, JPG, WebP and AVIF in your browser. Batch convert, control quality, nothing is uploaded.
- Image Resizer & CompressorResize images to exact pixels or a percentage and compress them, with a live before-and-after size comparison.
- Image CropperCrop images to any area or a fixed aspect ratio, with a draggable selection and live pixel readout.
File & data
3 tools- Merge PDF FilesCombine multiple PDFs into one, reorder pages before merging. Runs entirely offline in your browser.
- CSV to JSON ConverterConvert CSV or TSV into JSON with correct handling of quoted fields, embedded commas and type detection.
- Base64 Encoder & DecoderEncode and decode Base64 text, and turn any file into a Base64 data URI for embedding.
Text tools
2 toolsDeveloper tools
5 tools- Password GeneratorGenerate strong random passwords using your browser's cryptographic RNG, with a live strength estimate.
- Hash GeneratorCompute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files using the Web Crypto API.
- UUID GeneratorGenerate cryptographically random version 4 UUIDs in bulk, in several output formats.
- URL Encoder & DecoderPercent-encode and decode URLs and query strings, with a breakdown of each URL component.
- JSON Formatter & ValidatorFormat, minify and validate JSON with precise error locations, plus a collapsible tree view.
Finance
3 tools- Loan Payment CalculatorCalculate monthly payment, total interest and payoff date, with a full amortisation schedule.
- Compound Interest CalculatorProject savings growth with regular contributions, any compounding frequency, and a year-by-year table.
- IBAN ValidatorCheck an IBAN's checksum and structure against the official registry, and see which bank and country it belongs to.
Everyday
4 tools- Percentage CalculatorSolve every common percentage question — percent of, percent change, and what percent X is of Y.
- Unit ConverterConvert length, weight, temperature, volume, area and speed between metric and imperial units.
- QR Code GeneratorCreate static QR codes for links, text, WiFi and contacts. Free forever, works offline, no tracking or expiry.
- Date CalculatorCount days between two dates, add or subtract time, and work out exact age in years, months and days.
Construction
3 tools- Stair Stringer CalculatorCalculate rise, run, stringer length and tread count from your total floor height. Checks results against building code limits.
- Concrete Slab CalculatorWork out how many cubic yards or metres of concrete a slab needs, plus bag counts and a waste allowance.
- Roof Pitch CalculatorConvert roof pitch between rise-per-12, degrees and percent, then get rafter length and the true roof surface area.