# Fmtly

> An open source browser-based collection of developer utilities including JSON, XML, YAML, CSV and TOML formatters, validators, and encoders.

- Website: https://fmtly.dev/?ref=devshelf.io
- DevShelf page: https://devshelf.io/resource/fmtly
- Pricing: Free
- Tags: Open Source, No sign-up
- Categories: [Developer Utilities](https://devshelf.io/category/developer-utilities.md)
- Last checked: 2026-11-02

## About

Fmtly is an extensive, open source suite of developer utilities designed to run entirely client-side within the browser. It provides local processing for various data formats including JSON, XML, YAML, CSV, and TOML with tools for formatting, validation, minification, and conversion. Additional capabilities include text manipulation, Base64 and URL encoding, cryptographic hashing, QR code generation, AI token counting, and PDF utilities. Because all operations execute locally in the browser, no user data or code is transmitted to external servers, ensuring complete privacy during development tasks.

## Alternatives

- [Online Tools](https://devshelf.io/resource/online-tools.md): A comprehensive web-based collection of developer utilities for hashing, cryptography, compression, encoding, formatting, and text conversion. (pricing: Free)
- [Format JSON Online](https://devshelf.io/resource/format-json-online.md): A browser-based toolkit for formatting, validating, minifying, and converting JSON data locally. (pricing: Free)
- [HappyFormatter](https://devshelf.io/resource/happyformatter.md): A private, client-side code formatter and minifier running entirely in the browser without uploading code. (pricing: Free)

---

Source: DevShelf.io, the hand-reviewed catalog of dev tools and resources. Every resource is reviewed by hand before it is listed.