Every tool you need, in one tab
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Recently used
- Image Converter
- Image Resizer & Compressor
- Image Cropper
- Merge PDF Files
- CSV to JSON Converter
- Base64 Encoder & Decoder
- Word & Character Counter
- Text Case Converter
- Password Generator
- Hash Generator
- UUID Generator
- URL Encoder & Decoder
- JSON Formatter & Validator
- Loan Payment Calculator
- Compound Interest Calculator
- IBAN Validator
- Percentage Calculator
- Unit Converter
- QR Code Generator
- Date Calculator
- Stair Stringer Calculator
- Concrete Slab Calculator
- Roof Pitch Calculator
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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.
Free browser tools that never upload your files
Converters, generators and calculators that run entirely inside your browser. Nothing is uploaded, nothing is stored, and none of it needs an account.
Most online converters work by uploading your file to a server, processing it there, and giving you a link back. That means a copy of your document, photo or spreadsheet now sits on someone else's machine, governed by a privacy policy you did not read.
Browsers have been able to do this work locally for years. Canvas handles image encoding, the Web Crypto API handles hashing, and modern JavaScript handles the rest. Every tool here uses those APIs directly, which is why they keep working with the network disconnected — and why there is no upload progress bar.