
HTML Formatter
Free browser-based HTML beautifier, formatter & validator
What it does
HTML Formatter is a free, browser-based tool that lets developers instantly clean, format, and validate HTML code — no login, no file uploads to a server, no fluff. Everything runs 100% inside your browser — your code never leaves your machine, making it safe for private, client, or proprietary markup. • Formats & beautifies messy or minified HTML instantly • Validates HTML structure before formatting • Uploadhtml files or paste code directly • No install, no login, completely free
Does the same job
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- PTPaper to HTML Converter2021 · papertohtml.org · ▲153


JSON FormatterMay 2026 · formatjson.online · ▲2Beautify, validate & convert JSON — free, no login and fast.

More dev tools this month
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The first open-source price index for GPU compute
Dev tools · 10d ago · getcomputable.com

Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com

OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 2d ago · opentrailpaper.com
Launched alongside, May 2026
the whole month →

Parallel agents, diff reviewer, and multi-model comparisons
Dev tools · May 2026 · kilo.ai


- NW
Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…
Life & fun · May 2026 · github.com
- FM
Dev tools · May 2026 · github.com