Essential web tools.
All in one. Instantly.
Fast, private and free. Every tool runs entirely in your browser — nothing you open ever leaves your device.
Text & encoding
7 toolsCase ConverterConvert text between nine cases: camel, snake, kebab, title and more.List Cleaner & DeduplicatorTrim, dedupe and sort lists, with an exact account of what changed.Word & Character CounterCount words, characters and graphemes the way Unicode actually defines them.Text DiffCompare two texts and get a git-applyable unified diff.URL Encoder / DecoderEncode and decode URLs; errors point at the exact character and position.HTML Entities Encoder / DecoderEncode and decode HTML entities; unknown ones are reported, never mangled.Base64 Encoder / DecoderEncode and decode Base64 and URL-safe Base64, exactly as the RFCs define them.
Data & developer
15 toolsJSON FormatterPretty-print and validate JSON with numbers shown exactly as written.JSON to CSV ConverterJSON to CSV with your numbers kept verbatim, never mangled through floats.CSV to JSON ConverterCSV to JSON with your numbers kept verbatim, never mangled through floats.YAML ⇄ JSONYAML to JSON and back, with a count of what the conversion destroys.Number Base ConverterConvert between bases 2-36 with big integers: exact past 2^53, where parseInt fails.CIDR / Subnet CalculatorIPv4 and IPv6 subnets with exact counts, even 2^128 addresses, to the digit.Color Contrast CheckerWCAG 2 contrast compared unrounded — a displayed 4.50:1 can still fail AA.Regex TesterTest JavaScript regular expressions. A catastrophic pattern is refused, never a frozen tab.JWT DecoderDecode a JWT's header and claims on your device. Decoding is not verifying.File Hash / ChecksumSHA-1/256/384/512 checksums of any file, computed on your device.Unix Timestamp ConverterConvert Unix timestamps to ISO dates and back, always UTC-explicit.Cron Expression ExplainerTurn a cron expression into plain English, including the day-of-month OR trap.Unit ConverterConvert units with exact fractions, and be told whether the answer is exact.Currency ConverterExact currency conversion on the ECB's official reference rates.QR Code GeneratorGenerate QR codes as crisp SVG, deterministically, offline.
Images
7 toolsImage CompressorShrink PNGs losslessly or re-encode JPEG/WebP; output never larger than input.Image Format ConverterConvert images between PNG, JPEG and WebP, entirely in your browser.Image ResizerResize images with exact aspect arithmetic; upscaling is labelled, not sold.Image RotateRotate images 90/180/270 into the pixels themselves, not an orientation tag.Image CropCut a rectangle out of an image. What you crop is really deleted.Add Text to ImageStamp a caption or credit line on pictures. A signature, not protection.SVG to PNGRender SVG to PNG at a size you choose. We never invent one.
PDF MergerMerge PDFs into one file, in your order, on your device.PDF Split & ExtractExtract chosen pages from a PDF into a new file.PDF RotateRotate PDF pages in quarter turns, per page or all at once.PDF Page NumbersNumber PDF pages, each placed by its own size and rotation.PDF CropTrim PDF page margins. Cropping hides content; it does not delete it.PDF MetadataRead, edit or strip a PDF's title, author and dates, with XMP handled honestly.PDF WatermarkStamp text across PDF pages: a deterrent, not protection, and we say so.Images to PDF ConverterBundle images into one PDF, bytes embedded exactly as they are.PDF to ImagesRender PDF pages to PNG images. A picture, not a document.