58 free tools · No sign-up · Nothing to upload
Free online tools that run in your browser
Format JSON and SQL, compress PDFs and images, build schema markup, create invoices and more. Your text and files stay on your device.
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PopularCSS Micro-Interaction & Animation BuilderJSON Toolkit – Formatter, Validator, Beautifier & ConverterYouTube Thumbnail Analyzer & PreviewerRobots.txt & Sitemap Health InspectorPassword & API Key Entropy AnalyzerImage Compressor
- Free tools
- 58
- Categories
- 12
- Sign-ups needed
- 0
- Runs in your browser
- Local
CSS Micro-Interaction & Animation BuilderJSON Toolkit – Formatter, Validator, Beautifier & ConverterYouTube Thumbnail Analyzer & PreviewerRobots.txt & Sitemap Health InspectorPassword & API Key Entropy AnalyzerImage CompressorMerge PDFSmart PDF ToolkitOption Strategy BuilderCinematic Code Snippet AnimatorFree Invoice Generator & Estimate MakerMeta Tags & Open Graph GeneratorLocal .env & Secret Token ScannerQR Code, Barcode & Multi-Format GeneratorAPI Mock Server & Synthetic Data GeneratorText Difference CheckerInteractive Regex Tester & VisualizerLegacy Codebase Refactorer & Modernizer
Browse
Find the right tool by category
From developer utilities to PDF and image tools, every category groups tools that solve one job well.
- Developer ToolsJSON, SQL, XML, regex, QR codes9 tools
- Content Creator ToolsThumbnails and code animations5 tools
- Analytics ToolsUTM links, funnels, SaaS metrics7 tools
- Business ToolsInvoices, pricing, pitch decks6 tools
- Cybersecurity ToolsHashes and secret scanning2 tools
- Productivity ToolsTimers, time zones, Markdown5 tools
- SEO ToolsMeta tags, schema, SERP preview6 tools
- Privacy ToolsEXIF, PII and passwords5 tools
- AI ToolsPrompts, email and cost tools7 tools
- Image ToolsCompress, resize, convert, crop4 tools
- PDF ToolsCompress, split, convert, edit2 tools
- Finance ToolsOptions strategy builder1 tool
Start here
Popular tools
- FreeCSS Micro-Interaction & Animation BuilderVisual UI editor for generating pure CSS animations, progress bars, and geometric morphing effects.Open tool
- FreeJSON Toolkit – Formatter, Validator, Beautifier & ConverterFree online JSON Toolkit to format, validate, beautify, minify, repair, analyze, transform, and convert JSON into TypeScript, JSON Schema, CSV, YAML, and JavaScript.Open tool
- FreeYouTube Thumbnail Analyzer & PreviewerPreview thumbnails and titles across YouTube desktop, mobile, and feed layouts in light and dark mode.Open tool
- FreeRobots.txt & Sitemap Health InspectorSimulate search engine crawlers against your robots.txt rules and validate your XML sitemaps for structural SEO flaws.Open tool
- FreePassword & API Key Entropy AnalyzerEvaluate password strength, estimate GPU brute-force cracking time, and generate cryptographically secure API keys locally.Open tool
- FreeImage CompressorReduce image file sizes locally in your browser. Compress JPG, PNG, and WebP without losing quality.Open tool
- FreeMerge PDFCombine multiple PDF files into a single document instantly. Drag, drop, reorder, and merge.Open tool
- FreeSmart PDF ToolkitCompress, merge, split, convert and organize PDF documents with a free browser-based PDF toolkit.Open tool
- FreeOption Strategy BuilderBuild and analyze multi-leg options strategies with theoretical Greeks, payoff charts, break-even levels, probability estimates, and scenario analysis.Open tool
Hand-picked
Editor's picks
- FreeCinematic Code Snippet AnimatorConvert static code snippets into 4K 60fps animated typing videos for tutorials, Reels, and Shorts.Open tool
- FreeFree Invoice Generator & Estimate MakerCreate invoices, estimates and quotes with your logo, tax and discounts, then download a watermark-free PDF.Open tool
- FreeMeta Tags & Open Graph GeneratorGenerate optimized SEO meta tags and social sharing cards with real-time visual previews.Open tool
- FreeLocal .env & Secret Token ScannerScan code, .env files, and Git diffs locally in your browser to detect leaked API keys, AWS credentials, and high-entropy secrets.Open tool
Fresh releases
New and updated
- FreeQR Code, Barcode & Multi-Format GeneratorGenerate custom QR codes and professional barcodes for websites, Wi-Fi, contacts, products, events, and payments. Customize, preview, and download individual or bulk codes.Open tool
- FreeAPI Mock Server & Synthetic Data GeneratorDesign custom mock REST endpoints, simulate network latency and chaos testing, and export Express.js server scripts.Open tool
- FreeText Difference CheckerCompare two text files or text versions online. Highlight added, removed, and unchanged lines, ignore whitespace, and export differences for free.Open tool
- FreeSaaS Tier Pricing & Margin SimulatorEvaluate pricing models, server expenses, COGS, and gross margin profitability.Open tool
- FreeAI Email & Reply AssistantWrite professional emails, draft replies, improve existing messages, and summarize email conversations with customizable tones, templates, and writing controls.Open tool
- FreeAdvanced Word & Text CounterCount words, characters, sentences, paragraphs, and lines. Analyze keyword density, reading time, readability, and transform or clean text instantly.Open tool
- FreeAutomated SOP & Process BuilderGenerate formatted, printable Standard Operating Procedures (SOPs) and checklists from plain text descriptions.Open tool
- FreeSchema Markup (JSON-LD) Generator & TesterForm builder for creating validated Google-compliant structured data for Articles, FAQs, Products, Organizations, and Local Businesses.Open tool
- FreeProgrammatic SEO Content Cluster ArchitectGenerate complete hub-and-spoke SEO content strategies, including internal linking maps, URL structures, and search intent categorizations.Open tool
- FreeWeb Crypto Hash & HMAC SuiteGenerate highly secure cryptographic hashes, HMAC signatures, and SHA256SUMS file manifests locally in your browser.Open tool
How it works
From idea to result in three steps
Step 1: Find your tool
Search or browse by category. Every tool does one job and tells you what it can and cannot do.
Step 2: Paste, type or drop a file
Your input is processed in your browser, so there is no upload step and no account to create.
Step 3: Copy or download
Copy the result, download the file, or tweak the options and run it again.
Why ToolLok
Engineered for privacy and speed
Practical browser-based utilities that make everyday digital work faster, simpler and more private.
Private by design
Text, code and files are processed in your browser. What you enter does not need to be uploaded to a server.
Fast and lightweight
Nothing to install. Each tool loads on demand and works on modern phones, tablets and laptops.
No sign-up
Open a tool and start. No account, no email wall and no watermark on your results.
Built for real work
From JSON and SQL to invoices, PDFs and SEO markup: focused tools that do one job well.
Guides
Learn while you work
8 min readImage Compressor: Compress, Resize & Convert Images Online for FreeCompress, resize, and convert JPG, PNG, WebP, and AVIF images directly in your browser with ToolLok's free local image optimization tool.
7 min readMerge PDF Files Online: Combine, Reorder & Extract PDF Pages for FreeMerge multiple PDF files, reorder documents, and extract specific pages securely in your browser with ToolLok's free local PDF merger.
9 min readLocal .env & Secret Token Scanner: Detect API Keys, Credentials & Leaked SecretsScan .env files, source code, Git diffs, JSON and YAML for API keys, tokens, database credentials and private keys with ToolLok's free browser-based secret scanner.
Clear Answers
Frequently Asked Questions
Find answers to common questions about ToolLok and its browser based utilities.
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Tell us what you are trying to do. New tools are added based on what people ask for.