Compress, merge, and convert files — right in your browser, no uploads, no limits.
Fast, private tools powered by your device. PDFs, images, calculators, and converters — all processed locally with zero cloud dependency.
Image Compressor
Client-side processing
92%
Reduced
0.3s
Processing
0 B
Uploaded
Featured suites
Two specialized studios, zero cloud dependency
Engineered for zero-latency client-side manipulation with hardware acceleration.
Image Studio
Canvas 2D · WebP engine
Direct pixel manipulation without leaving device memory. Lossless compression, instant background removal, and precision crop algorithms audited for zero quality degradation.
PDF Document Suite
WebAssembly · Air-gapped
Process confidential PDFs, legal contracts, and financial bank statements. Fast WebAssembly compilation guarantees sensitive documents never touch 3rd-party servers.
All tools
Browse the full directory
42 in-browser tools across 7 categories
Compound Interest Calculator
Calculate compound interest growth over time.
Scientific Calculator
Advanced browser-based scientific calculator.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Date Calculator
Calculate days between dates or add/subtract time.
Loan Calculator
Plan your loans with a full amortisation schedule.
Percentage Calculator
Calculate percentages, percentage change, and percentage of a number.
Age Calculator
Calculate exact age in years, months, and days from a date of birth.
EMI Calculator
Calculate monthly EMI for home, car, or personal loans.
SIP Calculator
Estimate returns on Systematic Investment Plan (SIP) investments.
GST Calculator
Calculate GST amount and total price including or excluding GST.
Discount Calculator
Calculate the discounted price and amount you save.
BMI Calculator
Calculate Body Mass Index and check your weight category.
Unit Converter
Convert between units of length, weight, volume, temperature, and more.
JSON Formatter
Format, validate, and beautify JSON data instantly.
Image Compressor
Compress images without losing visible quality — right in your browser.
Background Remover
Remove background from images and make them transparent online for free.
Resize Image
Resize JPG, PNG, and WebP images by pixels or percentage.
Crop Image
Crop JPG, PNG, or WebP images to custom dimensions or standard aspect ratios.
Convert to JPG
Convert PNG, WebP, GIF, or SVG images to high-quality JPG.
Convert from JPG
Convert JPG images to PNG or modern WebP format.
Rotate Image
Rotate and flip images 90, 180, or 270 degrees clockwise or counter-clockwise.
Watermark Image
Add text or logo image watermarks to protect your photos.
Photo Editor
Enhance photos with brightness, contrast, saturation, and artistic filter presets.
Meme Generator
Create funny memes online with custom top and bottom text.
Merge PDF
Combine multiple PDF files into one single document.
Split PDF
Separate PDF pages or extract page ranges into separate files.
Compress PDF
Optimize and reduce PDF file size directly in your browser.
PDF to JPG
Convert PDF pages into high-resolution JPG images.
JPG to PDF
Convert JPG and PNG images into a clean PDF document.
Rotate PDF
Rotate PDF pages permanently by 90, 180, or 270 degrees.
Delete PDF Pages
Remove unwanted pages from your PDF document easily.
Extract PDF Pages
Extract selected pages from a PDF into a new document.
Watermark PDF
Add custom text watermarks to your PDF documents.
Add Page Numbers
Add sequential page numbers to your PDF document.
HEIC to JPG
Convert Apple HEIC photos to standard JPG format.
Image to Text (OCR)
Extract text from images using optical character recognition.
QR Code Generator
Create custom QR codes for URLs, text, or contact info.
Word Counter
Count words, characters, sentences, and paragraphs in your text.
Password Generator
Generate secure, random passwords instantly.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 to text.
URL Encoder / Decoder
Encode or decode URL parameters and strings.
Case Converter
Convert text between uppercase, lowercase, camelCase, and more.
Architecture
What makes Surn different?
Traditional online utilities upload your confidential files to remote servers and impose queues or paywalls. Surn executes directly on your device.
Sub-millisecond latency
Zero server queuesImages, PDFs, and formulas compile instantly using your device hardware acceleration. Eliminates network roundtrips, cloud queues, and upload timeouts completely.
Air-gapped privacy
Sandboxed memory runtimeConfidential contracts, tax PDFs, and personal photos are processed exclusively in isolated browser RAM via WebAssembly. No server ever sees or stores your data.
Audited integrity
IEEE-754 banking standardsCompound interest schedules, EMI amortization, currency ratios, and scientific calculations are continuously audited against global financial algorithms.
Compiles byte code on device V8 engine
All buffers flushed when tab is closed
Ideal for medical, legal, and financial files
Common questions
How Surn works
Surn uses HTML5 Canvas and WebAssembly. When you drop a photo or PDF, your browser executes the calculations and byte processing locally in sandboxed memory. The files never leave your computer or phone.
Yes. All calculators (such as Compound Interest, EMI amortization schedules, and Scientific expressions) are audited against standard banking algorithms, IEEE-754 precision, and backed by comprehensive automated test suites.
Yes. Every tool is 100% free with no usage limits, no watermarks, and no account registrations required.
Yes. Because the tool runtimes are completely client-side, cached pages work seamlessly without an active internet connection.