Free · Private · No sign-up

Free developer tools

Instant, browser-based tools to validate, encode, convert, generate, and inspect data — no sign-up, nothing leaves your browser.

Config

Config ValidatorValidate JSON, YAML, and TOML with plain-English error explanations.Config Formatter & ConverterFormat and pretty-print JSON, YAML, and TOML — and convert between them.Config VisualizerExplore JSON, YAML, and TOML as an interactive collapsible tree.

Encoding

Base64 Encode / DecodeEncode text to Base64 or decode Base64 back to text — instantly, in your browser.URL Encode / DecodePercent-encode or decode URLs and query parameters safely.JWT Decoder & ValidatorDecode a JWT to inspect its header and payload, and verify HS256 signatures.JWT GeneratorCreate and sign your own JSON Web Token with an HS256/384/512 secret.JWT ValidatorVerify a JWT signature and check expiry and not-before claims — pass or fail.

Converters

JSON ↔ CSV ConverterConvert a JSON array to CSV, or parse CSV back into JSON.YAML ↔ JSON ConverterConvert YAML to JSON or JSON back to YAML, both directions.JSON ↔ XML ConverterConvert JSON to XML or XML back to JSON, both directions.

Generators

UUID GeneratorGenerate random v4 UUIDs (and a nil UUID) — one or many at a time.Mock JSON Data GeneratorBuild a schema with a few clicks and generate realistic fake JSON test data.Password GeneratorGenerate strong random passwords with custom length and character sets.Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.Unix Timestamp ConverterConvert Unix epoch timestamps to human dates and back.

Utilities

Regex TesterTest regular expressions against sample text with live match highlighting.Cron Expression ExplainerTranslate a cron expression into plain English you can actually read.Diff CheckerCompare two blocks of text and highlight every added and removed line.String Diff CheckerCompare two strings and see word- or character-level changes highlighted inline.Color ConverterConvert colors between HEX, RGB, and HSL with a live preview.Case ConverterConvert text to camelCase, snake_case, kebab-case, Title Case, and more.

Images

Base64 ↔ Image ConverterConvert an image to a Base64 data URI, or decode Base64 back to an image.Image Resizer & CompressorResize, compress, and convert images between PNG, JPEG, and WebP.Photo EditorCrop, rotate, adjust colors, draw, and add text to any image — all in your browser.Object RemoverBrush over unwanted objects, text, or blemishes in a photo and erase them.

PDF

Merge PDFCombine multiple PDF files into one, in any order you choose.Split PDFExtract page ranges, remove pages, or burst a PDF into single pages.PDF EditorRotate, reorder, and delete pages, and add watermarks or page numbers.PDF to ImageConvert each page of a PDF into a PNG or JPEG image.Image to PDFCombine JPG, PNG, or WebP images into a single PDF, in any order.Compress PDFShrink PDF file size with lossless or image-based compression.

Video

Video CompressorReduce video file size without changing resolution — runs entirely in your browser.Bulk Video CompressorCompress many videos at once with one quality setting — no upload, all local.Video ResizerResize a video to any resolution — entirely in your browser, no upload.