iFormat Blog
File conversion & compression guides
Practical how-tos for converting, compressing and fixing PDFs, images, video, audio and ebooks. 89 guides and counting.
Latest guides
Images & photos
26 guides- How to Compress WebP Images: Quality Settings and Best Practices WebP is already smaller than JPG and PNG, but you can compress it further. Here are the optimal quality settings and when to use lossy vs lossless WebP.
- Best Image Format for Email Attachments: JPG, PNG, or Something Else? Not every image format works in every email client. JPG is the safest bet for photos, PNG for screenshots. Here is when to use each and what to avoid.
- How to Compress PNG to 50KB for Web Without Losing Clarity PNG files are notoriously large. Here is how to get them under 50KB for web use without making them look terrible, plus when to ditch PNG entirely.
- How to Reduce Image Size for Website Speed (Without Losing Quality) Images account for most of a web page's weight. Reducing their file size is the single biggest improvement you can make to page speed, Core Web Vitals, and bounce rate.
- What DPI Should I Use for Printing? Image Resolution Guide 300 DPI is the standard for photo prints, 150 DPI works for large posters viewed from a distance, and 72 DPI is screen-only. Here is how to check your image and calculate the right print size.
- Image Won't Upload? How to Fix Every Common Size and Format Error Image upload failing? Fix file too large, wrong format, wrong dimensions errors. Works for government forms, social media, and any website upload.
- HEIC Explained — Why Your iPhone Uses It and What to Do About It What is HEIC? Why does your iPhone use it? How to open HEIC on Windows and convert to JPG. Complete guide to Apple's photo format.
- How to Open AVIF Files — Viewers and Converters for Every Platform AVIF is a next-gen image format that not every app supports yet. Here's how to open, view, and convert AVIF files on Windows, Mac, iPhone, and Android.
- How to Open DDS Files — View and Convert Game Textures on Any PC DDS files are compressed textures used in games and 3D applications. Here's how to open, view, and convert DDS files on Windows and Mac using free tools.
- How to Open HEIC Files on Windows — 5 Methods That Actually Work Windows doesn't open HEIC files by default. Here are 5 free methods to view and convert iPhone HEIC photos on Windows 10 and 11 — no paid software required.
- AVIF vs WebP vs JPEG XL — Which Next-Gen Image Format Should You Use? AVIF, WebP, and JPEG XL all promise smaller files and better quality than JPEG. This guide compares them on compression, browser support, features, and real-world use cases.
- Image Editing Without Photoshop — Every Free Online Tool You Need You don't need Photoshop for everyday image editing. Here's a task-by-task guide to free online tools that handle resizing, cropping, conversion, and more.
- How to Download Any YouTube Thumbnail in Full Resolution Every YouTube video has a thumbnail image you can download in full 1280x720 resolution. Here's how to grab it with just the video URL.
- How to Fix a Sideways Photo From Your Phone (EXIF Rotation Explained) When a phone photo looks fine on your phone but shows up sideways everywhere else, EXIF rotation data is the culprit. Here's how to fix it for good.
- How to Flip a Selfie So Text Reads Correctly Your selfie looks great, but the text on your shirt reads backwards. Here's how to flip it so everything reads correctly without re-taking the photo.
- How to Blur the Background of a Headshot Without Photoshop You don't need Photoshop to get a clean, blurred background on a headshot. Here's how to do it with free tools and your phone's built-in features.
- How to Make a Photo Black and White Online (Free, No App) Converting a colour photo to black and white can transform an ordinary image into something striking. Here's how to do it for free in your browser.
- Social Media Image Sizes 2026 — The Complete Cheat Sheet Every platform has different image specs and they change constantly. Here are all the 2026 dimensions you need in one place.
- Instagram Image Sizes 2026 — Every Format, Every Dimension Instagram supports square, portrait, landscape, stories, reels, and carousels — each with different dimension requirements. Here are all the 2026 specs.
- Exporting RAW for Print vs Web: TIFF, JPG, or PNG? Your RAW file is edited. Now you need to export it — but TIFF for print, JPG for web, PNG for graphics? Here's how to choose the right format and settings.
- The Wedding Photographer's Workflow: Batch-Converting a Full RAW Shoot A wedding produces 2,000-4,000 RAW files. Here's the complete batch processing workflow — from card dump to client delivery.
- What Are DDS and TGA Files? A Guide to Game Texture Formats DDS and TGA are everywhere in game development but nowhere in regular computing. Here's what they are, why games use them, and how to open or convert them.
- RAW vs JPG: When to Shoot Each and When to Convert Every photography forum says "always shoot RAW" but that's not always the right advice. Here's when RAW genuinely matters and when JPG is the smarter choice.
- CR3 vs CR2: What Changed in Canon's RAW Format Canon uses two different RAW formats across its camera lineup. Here's the difference between CR3 and CR2, and what it means for your workflow.
- Why Won't My NEF, CR3, or RAF Files Open? Fixes for Windows and Mac Your camera's RAW files won't open on your computer. Here's why, and the actual fixes for Windows 10/11 and macOS.
- How to Remove a White Background from an Image Online for Free Need a transparent PNG? Remove the white background from product photos, logos, and headshots in seconds — no Photoshop, no installs.
- How to Compress PDF for LinkedIn Upload (Documents and Resumes) LinkedIn accepts PDF uploads for carousel-style document posts and resumes. Here is how to optimize them for fast loading, mobile viewing, and maximum engagement.
- How to Compress PDF for Government Form Upload (Portal Size Limits) Government upload portals have strict file size limits, often just 1-5MB. Here is how to compress your PDFs to meet those limits without making documents unreadable.
- How to Reduce Scanned PDF Size Without Losing Readability Scanned PDFs can be 5-10MB per page because each page is a full-resolution image. Here is how to shrink them dramatically while keeping text sharp and readable.
- Best PDF Settings for Amazon KDP Paperback Publishing Get your PDF right for Amazon KDP Print. Exact trim sizes, bleed settings, margins, fonts, and export settings for a professional paperback.
- How to Rotate and Fix Scanned PDF Pages That Are Upside Down Fix upside down or sideways scanned PDF pages. Learn how to rotate individual pages, batch rotate, and fix orientation for scanned documents.
- Free PDF Editor Tools in 2026 — No Adobe, No Download, No Sign-Up A complete guide to free PDF editing tools that work online — no Adobe subscription, no desktop software, no account creation.
- How to Scan Documents With Your Phone and Convert to Searchable PDF Your phone camera is a document scanner. Here is how to scan paper documents and create searchable PDFs with selectable text.
- How to Password Protect a PDF Before Emailing Tax Documents Tax returns, W-2s, and financial statements should never travel by email unprotected. Here is how to lock a PDF with a password before hitting send.
- How to Unlock a PDF You Already Have the Password For You have the password. You just do not want to type it every single time you open the file. Here is how to remove PDF password protection permanently.
- How to Add a Draft Watermark to a PDF Before Sending for Review Mark your PDF as DRAFT before sharing it for review. Practical approaches that work without Adobe Acrobat or paid watermarking software.
- How to E-Sign a PDF Without Printing, Scanning, or Paying Stop the print-sign-scan cycle. E-sign any PDF online without paying for DocuSign or Adobe Sign.
- How to Split a PDF by Page Range Online for Free Need pages 5-12 from a 200-page report? Split your PDF by page range online and download just the section you need.
- How to Extract Pages from a PDF Online for Free Pull specific pages out of any PDF into a new, smaller file. Works in the browser, keeps the original untouched.
- 5 Ways to Compress a PDF Under 1MB — Without Losing Quality Five practical approaches to shrink an oversized PDF below 1 MB, ranked from quickest fix to most effective for stubborn files.
- How to Merge PDF Files Online for Free — Combine Multiple PDFs Need to combine several PDFs into one file? Here is how to merge them online in the right order, without losing formatting or adding watermarks.
- How to Delete Pages from a PDF Online for Free Got blank pages, duplicate pages, or cover sheets cluttering your PDF? Here is how to remove specific pages without Acrobat.
- How to Fill Out a PDF Form Online for Free — No Adobe Needed Need to fill out a PDF form but do not have Acrobat? Here is how to type into any PDF form directly in your browser.
- How to Sign a PDF Online for Free — No Adobe Acrobat Needed Stop printing PDFs just to sign them. Draw or type your signature directly onto the document in your browser.
Video
15 guides- How to Convert and Compress Video for WhatsApp WhatsApp requires MP4 with H.264 codec and files under 16MB. If your video is in the wrong format or too large, here is how to fix it step by step.
- How to Convert iPhone Video to MP4 (MOV and HEVC to MP4) iPhones record video in MOV with HEVC encoding. Here is how to convert to MP4 for sharing, editing, and uploading — plus how to change your iPhone settings to record MP4 natively.
- MP4 Won't Play? Here Are the Fixes That Actually Work Your MP4 file shows a black screen, has no audio, or refuses to open. Here are the actual causes and the fix for each one.
- MKV vs MP4: Which Video Format Should You Use? MKV and MP4 are the two most popular video containers, but they serve very different purposes. Here is when to use each and how to convert between them.
- MOV vs MP4: Which Video Format Is Better? MOV and MP4 are the two most common video formats, but they are not interchangeable. Here's when to use each one and why MP4 wins for almost everything except Apple-specific editing.
- Video File Formats Explained — MP4, MKV, AVI, MOV, WebM & More A complete guide to video file formats. Compare MP4, MKV, AVI, MOV, and WebM by quality, compatibility, and when to convert.
- Why Won't My Video Play? How to Fix Unsupported Format Errors Fix 'unsupported format' and 'codec not found' video errors. Learn why videos won't play and how to convert MKV, AVI, MOV to universally compatible MP4.
- How to Digitize and Save Old Home Videos from a Camcorder Those old tapes in your closet are degrading right now. Here's how to get the footage off them and into a format that'll last, using equipment you can buy or rent.
- A Video Editor's Guide to Ingest and Delivery Formats (MXF, M2TS, MP4) You got footage in three different formats from three different cameras and need to cut a project. Here's how to handle MXF, M2TS, and MP4 in your edit timeline.
- M2TS vs MTS vs MP4: Camcorder Video Formats Explained Your camcorder gave you .m2ts files instead of .mp4 and now nothing will play them. Here's what these formats actually are and what to do with them.
- MPG vs MP4: What's the Difference and Should You Convert? You've got old .mpg files that barely play anywhere modern. Here's what MPG actually is, how it differs from MP4, and whether converting is worth it.
- RMVB and RM Files Won't Play? How to Convert Old RealMedia Videos Found old .rmvb or .rm files that nothing will play? RealMedia is basically a dead format. Here's how to convert those files to something modern.
- Camcorder Files Won't Import into Premiere or Final Cut? (M2TS, MOD, MXF) Your editing software refuses to import camcorder footage. Here's what's going wrong and how to fix it, format by format.
- How to Convert M2TS (AVCHD Camcorder Footage) to MP4 Your camcorder produced M2TS files and now nothing plays them. Here's how to convert AVCHD footage to MP4 without losing quality.
- How to Compress a Video for Free Online — MP4, MOV, AVI, WebM Your video is too big for email, Discord, or that upload form. Here's how to compress it down without turning it into a pixelated mess.
Tool comparisons
7 guides- Free Adobe Acrobat alternatives — 2026 comparison The best Adobe Acrobat alternatives in 2026. Free PDF editing, compression, signing, and OCR without the $19.99/month Acrobat Pro subscription.
- Ad-free FreeConvert alternatives — 2026 comparison The best FreeConvert alternatives in 2026. Convert files without the intrusive ads, account walls on advanced tools, or the paid plan. Honestly compared.
- Free CloudConvert alternatives — 2026 comparison The best CloudConvert alternatives in 2026. Convert files across 200+ formats without the 25-conversion-per-day free tier limit or the $8/month paid plan.
- Free Remove.bg alternatives — 2026 comparison The best Remove.bg alternatives in 2026. Free AI background removal without the low-resolution watermark or the $9/month paywall for full-res downloads. Honestly compared.
- Free TinyPNG alternatives — 2026 comparison The best TinyPNG alternatives in 2026. Compress PNG, JPG, and WebP without the 20-file batch limit or the 5 MB file cap. Compared honestly, ranked by output quality.
- Free iLovePDF alternatives — 2026 comparison The best iLovePDF alternatives in 2026. Free PDF compression, conversion, merging, and editing without file size limits or the $9/month premium. Compared honestly.
- Free Smallpdf alternatives — 2026 comparison The best Smallpdf alternatives in 2026. Free PDF compression, conversion, merging, and editing without the 2-task-per-day limit. Compared honestly.
Passport & ID photos
7 guides- How to Compress a Photo for Passport Application Under 200KB Most passport and visa portals require photos under 200KB. Here is how to resize and compress your photo to meet the exact requirements without triggering biometric recognition failures.
- Visa Photo Size Requirements by Country: Dimensions, Pixels, and File Size Every country has different visa photo dimensions, pixel requirements, and file size limits. Here are the exact specs for every major destination.
- Indian Passport Photo Size — 51x51 mm Digital Upload Guide for 2026 Indian passport photo: 51x51 mm, 350-1000 pixels, 20-100 KB, JPG. Complete guide for online passport application photo upload. Works for fresh and renewal.
- PAN Card Photo and Signature Size — NSDL and UTIITSL Requirements PAN card photo must be under 50 KB in JPG. Signature under 50 KB. Complete guide for NSDL and UTIITSL PAN application photo upload requirements.
- How to Crop a Photo to Exact Visa and Passport Dimensions Every country has different photo requirements for passports and visas. Here's how to crop your photo to the exact dimensions that won't get rejected.
- How to Resize a Photo to Passport Size Online for Free (2×2 in, 35×45mm) Passport photo booths charge $15 for something you can do at home with a phone and the right tool. Here's how to get the size exactly right.
- Aadhaar Card Photo Size Requirements 2026 — UIDAI Specifications UIDAI's Aadhaar photo rules are specific. Here are the exact dimensions, file size limits, and background requirements — plus how to resize your photo to fit.
Audio
7 guides- Audio File Formats Explained — MP3, WAV, FLAC, AAC, OGG & More A complete guide to audio file formats. Compare MP3, WAV, FLAC, AAC, OGG, and ALAC by quality, file size, and compatibility.
- MP3 vs FLAC vs WAV vs M4A vs OGG — Audio Formats Compared Three formats, three different philosophies. Here is when MP3, FLAC, and WAV each make sense and when they absolutely do not.
- A Musician's Guide to Sharing MIDI Compositions as Audio MIDI files play differently on every device. Convert your compositions to audio so your audience hears the arrangement the way you designed it.
- Lossless Audio Explained: FLAC vs ALAC vs APE vs WAV All four formats are lossless, but they differ wildly in compatibility, file size, and metadata support. Here is how to pick the right one.
- APE and ALAC Files Won't Play? How to Open Lossless Audio Anywhere APE and ALAC files won't play on most devices. Here is why, and how to convert them to formats that work everywhere.
- What Is a 3GA File? How to Open and Play Samsung Voice Recordings Samsung phones save voice recordings as .3ga files. Most computers and non-Samsung phones can't play them. Here is how to fix that.
- How to Convert M4B Audiobooks to MP3 (Listen on Any Device) M4B audiobooks don't play on most non-Apple devices. Here is exactly how to convert them to MP3 that works everywhere.
Ebooks
6 guides- How to Convert Kindle Books to EPUB — DRM-Free Guide Convert Kindle books to EPUB for reading on Kobo, Apple Books, or any e-reader. Covers DRM-free books, format differences, and conversion tools.
- How to Create a Kindle Book from a PDF or Word Document Turn your PDF or Word document into a Kindle ebook. Step-by-step guide covering formatting, conversion, and publishing through KDP.
- Ebook Formats Explained — EPUB, MOBI, PDF, AZW3, KFX & More A complete guide to ebook formats. Compare EPUB, MOBI, AZW3, PDF, and KFX by reader support, features, and when to use each.
- How to Open EPUB Files Without a Kindle — Free Readers for Every Device Got an EPUB file and not sure how to open it? Here are the best free EPUB readers for Windows, Mac, iPhone, iPad, Android — and how to read EPUBs on a Kindle.
- EPUB vs PDF vs MOBI — Which Ebook Format Is Best for Reading? EPUB, PDF, and MOBI each handle ebooks differently. This guide compares reflowable text, device compatibility, DRM, and reading experience to help you pick the right format.
- DjVu Won't Open? How to Convert Scanned Books to PDF DjVu files are common in academic archives but almost nothing opens them natively. Here's how to convert DjVu to PDF and why the format still exists.
Files & archives
3 guides- How to Compress Files for Email Attachments — Beat Every Size Limit Email attachment too large? Learn how to compress PDFs, images, videos, and documents to fit Gmail, Outlook, and Yahoo size limits.
- File Compression Formats Explained — ZIP, RAR, 7Z, GZIP, TAR & More A complete guide to file compression and archive formats. Compare ZIP, RAR, 7Z, GZIP, TAR, and BZIP2 by compression ratio, speed, and compatibility.
- ZIP vs RAR vs 7Z vs TAR — Which Archive Format and When ZIP vs RAR vs 7Z vs TAR compared. Compression ratio, compatibility, speed. When to use each archive format. Practical guide with real-world examples.