Free online developer tools

13 tools

Small utilities developers reach for daily: JSON and YAML formatters, Base64 and URL encoders, regex testers, JWT decoders, diff viewers and cron helpers. Prefer tools marked as running in your browser when you paste tokens, keys or production data, because nothing is uploaded.

Showing 1–13 of 13

0.661score
InstantCoder
osanseviero
Generates a small web app from a prompt and shows the result immediately.
ArtifactAINo sign-up★ 1.5Kdeveloper tools
0.647score
Screenshot to HTML
HuggingFaceM4
Upload a screenshot of a web page and get HTML that approximates it.
ArtifactAINo sign-up★ 934developer tools
0.624score
Qwen3 Coder WebDev
Qwen
Describe a web page or small app and Qwen3-Coder writes the HTML, with a live preview.
ArtifactAINo sign-up★ 1.2Kdeveloper tools
0.621score
Qwen2.5 Coder Artifacts
sambanovasystems
Describe a small app and get generated code that previews in the page.
ArtifactAINo sign-up★ 276developer tools
0.621score
Convert to Safetensors
safetensors
Converts PyTorch model weights to the safetensors format; asks for a Hugging Face token.
ArtifactNo sign-up★ 270developer tools
0.619score
Code Llama Playground
codellama
Generate and complete code by typing a prompt into the Code Llama playground.
ArtifactAINo sign-up★ 251developer tools
0.616score
Chat Template Playground
huggingfacejs
Edit a Jinja chat template and preview how it formats a conversation into model input text.
ArtifactNo sign-up★ 221developer tools
0.588score
DeTikZify
nllg
Converts a sketch or figure image into TikZ code for LaTeX documents.
ArtifactAINo sign-up★ 91developer tools
0.586score
GitHub Repo to Plain Text
Nymbo
Fetches a GitHub repository and merges its files into one text file for pasting into an LLM.
ArtifactNo sign-upIn-browser★ 66developer tools
0.585score
Llama Token Counter
Xanthius
Counts the number of tokens a piece of text uses with the Llama tokenizer.
ArtifactNo sign-up★ 80developer tools
0.583score
GitHub Issue Generator
reach-vb
Writes a GitHub issue draft with SmolLM2 running locally in the browser on WebGPU.
ArtifactAINo sign-upIn-browser★ 56developer tools
0.580score
WebLLM Structured Generation
mlc-ai
Generate structured output such as JSON from an in-browser WebLLM model.
ArtifactAINo sign-upIn-browser★ 50developer tools
0.561score
PGlite Semantic Search
thorwebdev
Vector search over documents using a Postgres running in WebAssembly (PGlite) inside the browser.
ArtifactAINo sign-upIn-browser★ 20developer tools