100KB Extension v1.1.1: Compress & resize files in 0ms directly in Google Chrome
Expert answers to the most common document, photo, and upload questions — all free tools, all private.
Passport photo rejected? The 7 most common reasons across the US, UK, Canada, Australia, India, France and Germany — and how to fix them in under 60 seconds.
Getting a "file too large" error? Here are the exact PDF size limits for UPSC (300 KB), USCIS (6 MB), IRCC (4 MB), HMRC (2 MB), UKVI (6 MB) and SSC (500 KB) — and how to fix it instantly.
Official UPSC photo requirements: 3.5×4.5 cm, 20–50 KB, white background. Signature: 10–20 KB. Exact specs and how to resize for UPSC portal.
DS-160 photo requirements: 600×600 px JPEG, max 240 KB, plain white background, no glasses. Step-by-step formatting and compression guide.
Need to compress a PDF to under 100 KB for UPSC, SSC or other government portals? Free browser-based tool — no upload, no server, results in seconds.
UK visa photo requirements: 600×750 px, 45×35 mm, light grey or cream background, 50 KB–10 MB. Official specs and common rejection reasons.
USCIS my.uscis.gov accepts files up to 6 MB. Learn accepted formats, rejection reasons, and how to compress PDFs and scans before uploading.
Need to compress a JPEG or PNG to exactly 50 KB for UPSC, SSC, IBPS or another portal? Free browser-based tool — your image never leaves your device.
NEET or JEE counselling portal rejecting your admit card PDF? Compress it to under 100KB, 200KB, or 300KB in seconds — free, no upload, works on mobile.
Discover how browser WebAssembly sandboxes and Canvas 2D enable high-speed PDF and photo compression without uploading files to servers.
Technical analysis of JPEG Discrete Cosine Transform (DCT) quantization, PNG Deflate Huffman coding, WebP VP8 intra-frames, and browser-based binary search quantization loops.
Learn how PDF object streams, FlateDeflate compression, and font subsetting compress PDFs under 100KB or 200KB for official portals.
Technical guide to ICAO Doc 9303 specs, 70-80% head height ratio, lighting uniformity, and avoiding biometric portal rejection.
Technical guide to ICAO Doc 9303 passport photo specs, biometric eye baselines, 70-80% crown-to-chin ratio, and country-by-country visa requirements.
An engineering deep dive into optical scanner mechanics, spatial DPI sampling, PDF object trees (%PDF-1.7), and WebAssembly FlateDecode stream deflation algorithms.
Technical guide to digital color spaces, 4:2:0 chroma subsampling, Discrete Cosine Transform (DCT) math, and client-side iterative JPEG compression.
A technical deep dive comparing client-side WebAssembly browser processing against legacy cloud server upload architectures from security, GDPR compliance, and latency perspectives.
Complete operational guide for formatting candidate photographs, signatures, and PDF marksheets for Indian government, banking, and recruitment portals.
Complete technical breakdown of Amazon product photo requirements: 1600px zoom thresholds, RGB (255,255,255) pure white background, 85% frame fill ratio, and image compression for Amazon SEO.
Fix blurry LinkedIn profile pictures and banners. Learn the exact 400x400 and 1584x396 pixel requirements and the 8MB limit.
Don't get your US Visa or Green Card application rejected! Learn the strict 600x600 px requirements, white background rules, and how to format your photo.