Free online developer tools

36 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 25–36 of 36

0.561score
MiniCPM5-2B WebGPU Pi
victor
Runs a small coding agent entirely in the browser using WebGPU, with no server needed for the model.
ArtifactAI★ 103developer tools
0.556score
Intune Policy Builder
ugurkocde
Template-based builder for Microsoft Intune settings such as BitLocker, update rings, Wi-Fi profiles and firewall rules, with AI help.
ArtifactAIdeveloper tools
0.553score
Code Creator
mikitan
Japanese-language generator: describe what you want, pick HTML, CSS, PHP or C and a style, and get commented code.
ArtifactAIdeveloper tools
0.544score
The Tokenizer Playground
Xenova
Lets you try different tokenizers on your text and compare how each one splits it into tokens.
ArtifactAI★ 720developer tools
0.478score
Chrome Built-in Model Playground
Simon Willison
Runs prompts against the language model built into Chrome, downloading it on first use.
ArtifactAINo sign-upIn-browserdeveloper tools
0.477score
Claude Token Counter
Simon Willison
Counts tokens for text and image attachments across several Claude models using Anthropic token-counting API and your key.
ArtifactAINo sign-updeveloper tools
0.477score
llm-lib Demo
Simon Willison
Try one JavaScript library against OpenAI, Anthropic or Gemini models by picking a provider and pasting a key.
ArtifactAINo sign-updeveloper tools
0.477score
OpenAI Prompt Caching Playground
Simon Willison
Sends prompts with different structures to OpenAI and shows how many tokens were served from cache.
ArtifactAINo sign-updeveloper tools
0.442score
Web Search MCP
victor
Searches the web and extracts page content in a form suited to feeding into LLMs.
ArtifactAI★ 173developer tools
0.438score
AutoTrain Advanced
autotrain-projects
No-code interface for training machine learning models on your own data with Hugging Face AutoTrain.
ArtifactAI★ 141developer tools
0.438score
— Hub API Playground —
enzostvs
Playground for trying out Hugging Face Hub API calls from the browser.
ArtifactAI★ 140developer tools
0.436score
QwenSite
enzostvs
Describe an application in plain text and have a Qwen model generate its code for you.
ArtifactAI★ 133developer tools