Free, private, browser-based tools

Unescape, extract, validate, filter and preview URLs from JSON, REST, GraphQL, Postman and Insomnia API responses.

Turn Markdown or JSON into interactive project checklists with progress tracking, multiple lists, and one-click export.

See the hidden metadata in a photo — including where it was taken — and download a clean copy without it.

Convert a cURL command into fetch, Axios, Python requests, httpx or Go — in your browser.

Work out an exact age, or the span between any two dates, in years, months, days, weeks and working days.

Decode JSON Web Token headers and payloads to inspect claims without sending them anywhere.

Split a bill by what each person actually ordered, share the tip fairly, and see the fewest payments that settle everyone up.

Compare two blocks of text or JSON line by line and see exactly what was added, removed or changed.

Convert JPG images to lossless PNG in batches — and optionally turn a white background transparent. No upload, no watermark.

Preview OpenAPI and Swagger specs as readable docs with sample responses — no Docker, no upload.

Verify Stripe, GitHub, Shopify and Slack webhook HMAC signatures locally in your browser.

Generate strong random passwords, memorable passphrases or PINs, with the exact strength and a realistic crack time for each.

Test regular expressions against sample text with live match highlighting, capture groups and flags.

Compress a batch of JPG, PNG and WebP images to a quality or a target file size, with a before-and-after slider — no upload.

Seven percentage calculators on one page — percent of, what percent, change, add or remove %, reverse % and more — with the working shown.

Convert PNG images to JPG in batches with a quality slider and your choice of colour for transparent areas — never a black box.

Resize a batch of images by pixels, percentage, longest side or social media size — fit, crop or pad, never blurry enlargements.

Work out monthly repayments, total interest and a full amortisation schedule — and see exactly what overpaying saves.

Convert between Unix timestamps (seconds or milliseconds), ISO 8601, UTC and your local time — both directions.

Convert CSV or TSV to JSON as you type — auto-detected delimiter, safe type detection, nested keys and JSON Lines. No upload.

Generate v4 or time-ordered v7 UUIDs, one or 10,000 at a time, as a list, JSON, SQL or CSV — and decode any UUID you paste.

Convert any colour between HEX, RGB, HSL, HWB, OKLCH, HSV and CMYK, check WCAG contrast and get an 11-step tint and shade scale.

Count words, characters, sentences and paragraphs as you type, with reading time, readability, keyword density and character limits.

See your text in 13 cases at once — camelCase, snake_case, kebab-case, Title Case and more — with whole lists converted line by line.