The complete FileFusion platform
Professional digital tools, developer sandbox services, and engineering education — all free, all private, no account required.
Eight tools for everyone
Browser-based, private, and built for real workflows — from quick tasks to professional pipelines.
Text Comparison Tool
The most private diff tool on the web
Compare two documents, code snippets, or data files with character-level precision — entirely in your browser. The intelligent diff engine highlights every addition, deletion, and modification with color-coded overlays. Used daily by developers for code review, lawyers for contract revisions, and editors for proofreading.
Common use cases
- Review pull request diffs without uploading code to a third party
- Compare two versions of a legal contract before signing
- Proofread content edits — see exactly what changed between drafts
- Audit configuration files for accidental changes
File Size Reducer
Compress up to 80% — quality stays
Reduce PDF, image, and document file sizes using adaptive compression algorithms that analyse each file type and apply optimal settings automatically. No fixed quality presets — the engine targets the best size/quality balance for your specific file. Ideal before emailing, uploading to a portal, or archiving.
Common use cases
- Reduce a scanned PDF from 15 MB to under 2 MB for email
- Optimise product photos for fast page loads without visible loss
- Compress Word documents before submitting to an online portal
- Batch-reduce a folder of images for storage savings
PDF Merge & Split
Full page-level control over your PDFs
Merge multiple PDF files into a single ordered document, or split a large PDF into precise page ranges. Drag-and-drop reordering lets you set the exact page sequence before merging. Extract just the pages you need from a 200-page report. Maintain vector quality throughout — no re-rendering, no resolution loss.
Common use cases
- Consolidate monthly reports into a single annual document
- Extract one chapter from a large ebook or manual
- Merge scanned receipts into one file for expense reporting
- Split a large form pack into individual client files
QR Code Generator
Custom QR codes with brand identity
Generate fully customised QR codes for any URL, plain text, WiFi credentials, or contact card. Embed your logo, set brand colours, choose error-correction level, and export high-resolution PNG or crisp SVG. QR codes never expire — there is no server to go down because the code itself encodes all the data.
Common use cases
- Add QR codes to business cards that link to your portfolio
- Print WiFi credentials on a card for guests — no password sharing
- Put a QR code on product packaging to link to a how-to video
- Generate event ticket QR codes for check-ins
OCR Text Extractor
AI text recognition across 13 languages
Extract editable, searchable text from any image, screenshot, or scanned document using an advanced AI recognition engine. Handles printed text with near-perfect accuracy and has strong support for handwriting. Processes multi-page PDFs page by page. Outputs clean, formatted text ready for editing or search indexing.
Common use cases
- Extract text from a scanned contract so you can search and edit it
- Digitise lecture notes from a whiteboard photo
- Convert a printed form into editable data without retyping
- Pull product information from a photo of a receipt or label
AI Background Remover
Professional-grade cutouts in one click
Remove backgrounds automatically using industrial-grade AI edge detection that distinguishes subjects from complex backgrounds — hair, fur, and fine edges included. Produces clean transparent PNGs immediately. No manual masking, no Photoshop required. Outputs are ready for product listings, presentations, or composite designs.
Common use cases
- Create clean product images for an e-commerce listing
- Make profile photos with a transparent or custom background
- Prepare assets for a presentation without a photo editor
- Design marketing banners by compositing subjects onto new backgrounds
Barcode & QR Scanner
Decode any code — camera or image upload
Decode barcodes and QR codes directly from your browser using the device camera in real time or by uploading an image file. Supports every major format used in retail, logistics, and events. No app to install, no hardware needed beyond a phone or webcam. Decoded results can be copied, exported, or followed as a link.
Common use cases
- Look up a product from its barcode while shopping
- Scan event tickets for check-ins from any browser
- Decode a QR code from a screenshot without a phone
- Verify a printed barcode reads correctly before going to print
JSON Validator & Power Tool
Validate, format, query — entirely local
Validate and format JSON with real-time syntax highlighting and actionable error reporting. Smart Auto-Fix corrects the most common mistakes — missing commas, unquoted keys, trailing commas — automatically. JSONPath querying lets you extract specific values from deeply nested structures. Schema validation against a JSON Schema draft. All processing happens locally: your API responses and config files never leave your browser.
Common use cases
- Debug a malformed API response before filing a bug report
- Pretty-print minified JSON from a network response
- Extract a nested field value across a large JSON config
- Validate a JSON file against a schema before deploying
Sandbox infrastructure, no setup
Professional-grade services for testing, debugging, and de-risking your integrations before they hit production.
Mock API
Professional REST sandbox with chaos engineering
A stateless REST API sandbox that generates realistic, schema-driven response data on every request. Configure delay, HTTP error codes, and chaos parameters (random 5xx injection, network simulation) to stress-test your frontend against real failure modes. No keys, no registration — endpoint is live the moment you open it.
Common use cases
- Prototype a new frontend feature before the real API is built
- Test loading states and skeleton UIs with configurable delays
- Build E2E tests that always get deterministic data
- Demo a product to a client without needing a live backend
Webhook Tester
Real-time HTTP callback inspector
Point any service at your personal webhook endpoint and watch every incoming request arrive in a live log — headers, body, query params, and timing. Define custom response rules so your webhook replies exactly as your integration expects. Essential for debugging CI/CD pipelines, payment callbacks, and third-party integrations.
Common use cases
- Verify a Stripe webhook fires correctly after a test payment
- Debug a GitHub Actions webhook without deploying a server
- Inspect the exact payload structure a new SaaS sends
- Test webhook retry logic by returning configurable error codes
Email Sandbox
Black-hole SMTP — preview without sending
A disposable SMTP server that catches outbound emails from your development or staging environment and renders them in a preview inbox. Inspect full HTML rendering, check spam scores, verify attachments, and analyse headers — without ever sending a message to a real recipient. Prevents the classic "oops, sent 500 test emails to customers" incident.
Common use cases
- Preview a new email template across simulated clients
- Verify transactional emails fire correctly after a user action
- Check spam headers before switching to a production SMTP service
- Test bulk sends on staging without a real email quota
Payment Simulator
Full payment lifecycle — zero financial risk
Simulate the complete payment intent lifecycle — create, confirm, fail, refund — in a stateless sandbox that dispatches realistic webhook events to your server. Trigger fraud scenarios, network timeouts, and card decline codes on demand. Build and harden your checkout flow without touching a test account or risking real transactions.
Common use cases
- Test how your order page handles a card decline gracefully
- Verify your refund logic fires the correct webhook handler
- Simulate a payment network timeout and check retry behaviour
- Load-test checkout without generating real payment records
Engineering depth, open to all
Long-form technical articles and structured programming courses — peer-reviewed, up to date, and permanently free.
Engineering Guides
Peer-reviewed technical depth, free forever
In-depth long-form articles on the technologies powering FileFusion and modern software engineering at large. Topics include diff algorithm theory (Myers vs Patience), PDF internal architecture, OCR accuracy techniques, image compression mathematics, and security-conscious file handling. Written by practising engineers and updated as standards evolve.
Common use cases
- Understand why your diff tool chose a specific change region
- Learn how PDF compression works before trusting a tool with sensitive documents
- Study OCR accuracy trade-offs before integrating it into a product
- Deep-dive into file format internals for an engineering interview
Programming Courses
Structured learning paths from zero to production
Structured engineering courses covering Python, JavaScript, HTML5, and C. Each course progresses from core fundamentals to advanced topics — pointers and memory management in C, async/await patterns in JavaScript, DOM APIs in HTML5, and data science with Python. Code examples follow modern language standards and are tested against current runtime versions.
Common use cases
- Master JavaScript async patterns before writing your first API client
- Understand C memory management before taking a systems programming role
- Learn Python from scratch to automate repetitive file tasks
- Get up to speed with HTML5 APIs for a frontend project quickly
Enterprise Security
Files processed with encryption and deleted immediately. Browser-based tools never upload your data. Your documents are yours alone.
Instant Performance
Adaptive algorithms, chunked processing for large inputs, and hardware acceleration where available. Results in seconds, not minutes.
Universal Access
Every modern browser on every platform — Windows, Mac, Linux, iOS, Android. No install, no account, no restrictions.
Why FileFusion?
Three principles that never get compromised
No Sign-Up, Ever
Every tool, service, and article is available immediately — no account, no email, no credit card. Access is not gated behind a registration wall.
Your Data Stays Yours
Files are never stored on our servers after processing. Browser-based tools never upload your data at all. We cannot see what you process.
100% Free, No Limits
No freemium tier, no paywalled features, no usage caps. The full platform — all tools and all services — is free forever for everyone.
Still have questions?
Detailed answers about privacy, security, file limits, and browser compatibility are in our help centre.