82 tools run in your browser
Text tools, formatters and calculators work on data that stays on your device.
Developer toolsFree online tools for files, text and code, in one place
Merge PDFs, compress images, convert files, count words and format JSON in seconds. Free online tools for images, PDFs, text, AI and code, and most of them work without an account.
Popular jobsCompress an imageMerge PDFsPDF to WordCount LLM tokensFormat JSON
Browse tools
- LLM Token Analyzer & Prompt OptimizerCount tokens, estimate API usage, optimize prompts, and discover ways to reduce unnecessary token consumption.
- LLM Cost CalculatorEstimate and compare AI API costs based on tokens, usage, and model pricing.
- Context Window CheckerCheck prompt size against a model context window.
- JSON FormatterPretty-print JSON locally.
- Password GeneratorGenerate secure random passwords in the browser.
- QR Code GeneratorGenerate QR codes from text or URL.
- Image CompressorCompress JPG, PNG and WebP images online.
- Image ResizerResize images by pixels or percentage online.
- PDF to TextExtract text from PDF files in the browser.
- Images to PDFCombine multiple images into a single PDF.
- Merge PDFMerge multiple PDFs into one file.
- Meta Tag GeneratorGenerate HTML meta tags, Open Graph and Twitter/X Card tags.
Free file converter for common formats
Everyday conversions between PDF, Word, JPG, PNG and more, one click from the tool.
Browse every category
From a quick image fix to AI cost estimates, each category has its own page.
- LLM ToolsToken counting, cost estimation, context-window checks, and other utilities for working with large language models.4 tools
- Developer ToolsFormat, validate, encode, and generate data in the browser. JSON, Base64, URLs, UUIDs, regex, and more.22 tools
- CalculatorsStraightforward calculators for percentages, dates, interest, and everyday numeric work.3 tools
- ConvertersConvert JSON to and from CSV, XML, YAML and Base64, right in your browser.8 tools
- GeneratorsGenerate passwords, QR codes and email signatures.3 tools
- SEOAnalyze. Understand. Improve. A full SEO audit tool plus meta tags, schema, Open Graph, robots.txt, and other web SEO helpers.17 tools
- Image ToolsCompress, resize, convert, crop and rotate images. JPG, PNG, WebP and more. Most tools process your image on our servers and delete it afterwards; the Image Resolution Checker runs entirely in your browser.11 tools
- PDF ToolsConvert, compress, merge, split and extract content from PDF and document files. Most tools run directly in your browser.36 tools
- AI ToolsAI-powered image editing, provenance checking, originality analysis, rewriting, and content optimization. Uploads are processed and discarded — never stored permanently.11 tools
Try a free word counter right here
Paste any text and see the counts update as you type. This runs in your browser, and nothing you type here is sent anywhere.
Open the Word Counter- Words
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- Reading time
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Every tool page says whether it runs in your browser or on our servers.
33 use our servers
Tools that need more than a browser can do, such as most image tools, process your file on our servers. Details are in the Privacy Policy.
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Image tools, made simple
Compress, resize, convert and crop images in a few clicks. Image files are processed on our servers.
Open image toolsBuilt for developers and AI work
Count tokens, estimate API cost, format and validate JSON and test regex. These all run in your browser.
Open developer toolsQuestions, answered
The short version of how Auro Tools works.
Do I need an account to use the tools?
Most tools work without one. Downloading results from file tools needs a free account, which takes a minute to create.
Are my files safe?
82 tools run in your browser, so your text and data stay on your device. The other 33, such as most image tools, process your file on our servers. The Privacy Policy explains how uploads are handled.
Is Auro Tools free?
Free tools stay free and need no credit card. Premium is optional and adds saved history, higher input limits for document tools and API access for batch processing.
What can I do with it?
There are 115 tools across images, PDFs, text, AI and LLM work, developer utilities and calculators, with more categories listed above.
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115 free tools, most of them ready without an account.