100KB Extension v1.1.1: Compress & resize files in 0ms directly in Google Chrome
High-speed document utilities. Resize photos, signatures, and PDFs under strict size limits instantly — 100% free, private, and browser-side client processing.
Create biometric passport, visa, and ID photos online. Crop, adjust dimensions, remove background, and download official 4x6" and A4 print sheets.
Reduce image file size in KB or MB online. Compress JPG, PNG, and WebP files securely without changing dimensions.
Optimize signatures and fingerprints under strict size limits. Clean background contrast and scale dimensions.
Combine a passport photo and signature vertically or horizontally into a single image, keeping the combined file under 100KB.
Remove background from images and passport photos online for free in full original quality. Unlike other expensive alternatives, we do not reduce quality.
Remove digital watermark stamps, certification dates, or scanner artifacts securely from documents and certificates.
Convert Apple HEIC and HEIF photos to standard JPG or PNG images securely. Maintain 100% privacy.
Increase image size in KB online. Inflate JPEG and PNG photos to exact minimum KB limits securely.
Resize image dimensions in pixels, mm, cm, or inches online. Crop photos in circle, square, or rounded corner shapes.
Convert PNG and WebP images to JPG format online instantly. Compress file size to target KB limits for form uploads.
Convert JPG, JPEG, and WebP images to PNG format online instantly with loss-free quality and target KB limits.
Compress PDF files to a target size secure. Optimize scanned documents and certificates with zero quality loss.
Convert JPG, JPEG, and PNG images into PDF files. Automatically scale and compress pages to fit under your desired limit.
Combine multiple PDF documents or certificates into a single file. Control order, sort pages, and optimize output size.
Extract text contents from PDF documents and export them as editable Word files (.doc) or text files (.txt).
Split PDF documents by custom page ranges or extract specific pages securely with zero data leakage.
Unlock password-protected PDF files and remove permission restrictions (printing, copying, editing) securely.
Convert PDF document pages into high-resolution JPG images online under 100KB, 200KB, or high DPI.
Applying for UPSC, SSC, IBPS, or US Visa? Click a quick-preset below to launch the correct resizer:
Access dedicated tools, requirements, and formatting guidelines for popular government portals.
Zero file uploads, zero server databases, maximum document confidentiality.
All image compression, cropping, and PDF merging execute strictly inside your device's memory using modern HTML5 APIs and WebAssembly.
Iterative compression algorithms analyze pixel variance to shrink file sizes down to exact target thresholds (50KB, 100KB, 200KB) with zero legibility loss.
Auto-centers head position, removes backgrounds, and enforces 300 DPI high resolution required for passport and visa portal submissions.
Verified specifications for major identity documents, visa applications, and examination boards.
| Portal / Document Type | Accepted Format | File Size Ceiling | Dimensions / Resolution |
|---|---|---|---|
| US Visa (DS-160 / DV Lottery) | JPEG / JPG | ≤ 240 KB | 600 x 600 px (2x2 inches) |
| UK Passport & Visa (UKVI) | JPEG / PNG | 10 KB - 6 MB | 35 x 45 mm (Min 600x750 px) |
| Schengen Visa (EU Identity) | JPEG / JPG | ≤ 200 KB | 35 x 45 mm (300 DPI) |
| UPSC / SSC Exam Passport Photo | JPEG / JPG | 20 KB - 50 KB | 3.5 x 4.5 cm (350x450 px) |
| UPSC / SSC Signature Upload | JPEG / JPG | 10 KB - 20 KB | 3.5 x 1.5 cm (350x150 px) |
| Scanned Certificate / PDF Attachment | ≤ 100 KB / 300 KB | Standard A4 (Portrait) |
100kb.in utilizes WebAssembly modules and HTML5 Canvas APIs running inside your web browser. When you drop a file onto our tool, your device's CPU performs pixel quantization, matrix scaling, and stream compression locally. No file data ever leaves your computer or phone.
Most government servers enforce automated file validation checks. Uploads are rejected if the file size exceeds strict ceilings (e.g. over 50KB for signatures or over 100KB for PDFs), if image dimensions deviate from required aspect ratios, or if DPI resolution is below 300 DPI.
Yes, completely. Because processing happens 100% locally on your machine, your files never touch any external server, database, or cloud storage. Once you close or refresh your browser tab, all transient data is wiped from your browser memory.
Yes. All tools on 100kb.in are 100% free with no hidden subscriptions, no file download limits, and no registration required.
Deep-dive engineering articles on WebAssembly memory isolation, JPEG DCT quantization, and biometric standards.
Discover how browser WebAssembly sandboxes and Canvas 2D enable high-speed PDF and photo compression without uploading files to servers.
Compress ImageTechnical analysis of JPEG Discrete Cosine Transform (DCT) quantization, PNG Deflate Huffman coding, WebP VP8 intra-frames, and browser-based binary search quantization loops.
Compress PDFLearn how PDF object streams, FlateDeflate compression, and font subsetting compress PDFs under 100KB or 200KB for official portals.
Passport Photo MakerTechnical guide to ICAO Doc 9303 passport photo specs, biometric eye baselines, 70-80% crown-to-chin ratio, and country-by-country visa requirements.
All files are processed inside your System sandbox. Your personal documents, photos, and signatures never leave your device.
Need another file size calculator, custom crop preset, or specific utility? Let us know, and we'll build it for you.