Every small tool, one place.
Convert images, crunch numbers, clean up text, decode tokens and more. No signup, no upload for most of them, and nothing to install.
Popular: API URL ExtractorChecklist TrackerEXIF RemovercURL to CodeAge Calculator
Try one right now
No signup, no upload — this runs entirely in your browser.
Browse by category
Nine areas, each with a home of its own.
Image
Convert, resize, compress and inspect images — without uploading them anywhere.
Files & Data
Convert between document and data formats — CSV, JSON, YAML, Markdown and more.
Developer
Utilities for working with APIs, data formats, encoding and the web platform.
Text
Compare, transform, clean and analyse text of any size.
Calculators
Everyday maths, unit conversion, dates and health metrics you keep redoing.
Money
Loans, interest, tax, currency and salary calculators.
Featured tools
The ones worth knowing about first.
API URL Extractor
Unescape, extract, validate, filter and preview URLs from JSON, REST, GraphQL, Postman and Insomnia API responses.
Data & URLsChecklist Tracker
Turn Markdown or JSON into interactive project checklists with progress tracking, multiple lists, and one-click export.
Lists & PlanningEXIF Remover
See the hidden metadata in a photo — including where it was taken — and download a clean copy without it.
Edit & OptimiseMost popular tools
The ones people reach for most often.
API URL Extractor
Unescape, extract, validate, filter and preview URLs from JSON, REST, GraphQL, Postman and Insomnia API responses.
Checklist Tracker
Turn Markdown or JSON into interactive project checklists with progress tracking, multiple lists, and one-click export.
EXIF Remover
See the hidden metadata in a photo — including where it was taken — and download a clean copy without it.
cURL to Code
Convert a cURL command into fetch, Axios, Python requests, httpx or Go — in your browser.
Age Calculator
Work out an exact age, or the span between any two dates, in years, months, days, weeks and working days.
JWT Decoder
Decode JSON Web Token headers and payloads to inspect claims without sending them anywhere.
Bill Splitter
Split a bill by what each person actually ordered, share the tip fairly, and see the fewest payments that settle everyone up.
Diff Checker
Compare two blocks of text or JSON line by line and see exactly what was added, removed or changed.
OpenAPI Viewer
Preview OpenAPI and Swagger specs as readable docs with sample responses — no Docker, no upload.
Webhook Signature Verifier
Verify Stripe, GitHub, Shopify and Slack webhook HMAC signatures locally in your browser.
Recently added
Age Calculator
Work out an exact age, or the span between any two dates, in years, months, days, weeks and working days.
Bill Splitter
Split a bill by what each person actually ordered, share the tip fairly, and see the fewest payments that settle everyone up.
cURL to Code
Convert a cURL command into fetch, Axios, Python requests, httpx or Go — in your browser.
EXIF Remover
See the hidden metadata in a photo — including where it was taken — and download a clean copy without it.
Why use these
Small utilities that respect your time and your data.
Instant
No signup, no install, no cookie wall. Open a tool and use it.
Private by default
Most tools process everything in your browser. See the full list.
One consistent place
36 tools sharing one interface, one search box and one set of keyboard shortcuts.
Explained, not just shipped
The guides cover the formats and edge cases behind the tools.
Frequently asked questions
What is API URL Kit?
API URL Kit is a hub of small, focused online tools — image converters, calculators, text utilities, AI helpers, file and data converters and developer utilities. Each one does a single job well and opens instantly, with no signup.
Do I need an account?
No. Every tool currently on the site is free to use with no signup, login or installation.
Is my data private?
Most tools here run entirely in your browser, so your input never reaches a server. Those tools are collected on the private, browser-based tools page, and any tool that does need a server is labelled on its own page.
How many tools are there?
There are 36 tools in the catalogue, 12 of them live and working today. The rest are listed as coming soon so you can find them — browse the full catalogue.
Can I use these tools offline?
Tools marked "Runs in your browser" do all their work client-side, so once the page has loaded they keep working without a connection. Reloading the page still requires one.