Guides
95 guides on compressing, converting, and resizing images. The platform pages are measured: real files uploaded to the real service, downloaded again, and compared byte for byte.
Compressing images
- How to Compress an Image: Every Method, Real NumbersHow to compress an image in the browser, on Windows, Mac, Office, or your phone, with measured before and after sizes for every route.
- How to Compress Multiple Images at Once: Every MethodHow to compress multiple images at once: a free browser batch tool, built-in Mac and Windows options, and command-line tools for large folders.
- How to Make an Image Smaller: Bytes vs PixelsHow to make an image smaller depends on bytes or pixels, and each needs a different fix. Tested numbers, KB targets, and every device covered.
- How to Reduce Image File Size: Every Method That WorksHow to reduce image file size in your browser, on your phone, or in Word: real levers, byte numbers you can check, and the fastest fix first.
- Reduce Image Resolution: Pixels vs DPI ExplainedReduce image resolution means cutting pixel dimensions, not DPI. See the pixel-count math and tested steps for Mac, Windows, and the command line.
On your device
- Compress Image Size on Any Device: Every Built-In RouteCompress image size on Windows, Mac, iPhone, or Android with the tools already on the machine, plus the one browser method that works everywhere.
- How to Compress an Image in Krita, TestedHow to compress an image in Krita: export to JPEG or WebP with the right slider, use the lossless PNG compression level, and resize before you export.
- How to Compress an Image in PhotoshopHow to compress an image in Photoshop: Export As, Save for Web, and Image Size, which quality setting to use, and when a browser tool is faster.
- How to Compress an Image on Mac: 5 Free MethodsHow to compress an image on Mac using Preview: cut pixel dimensions, drop quality on export, or batch a whole folder, no extra app required.
- How to Compress Images on Windows: 3 Free MethodsHow to compress images on Windows with Paint, the Photos app, and PowerToys Image Resizer, plus the quality-only trick that skips resizing.
- How to Reduce Image Size on Android, Any PhoneHow to reduce image size on Android: resize in the Samsung Gallery, cap uploads with Google Photos, or use a browser compressor that works on any phone.
- How to Reduce Image Size on iPhone: 6 Ways That WorkHow to reduce image size on iPhone: switch to High Efficiency, use the Files app's Convert Image, Mail's resize, a Shortcut, or a compressor.
For a specific job
- Compress Images for Upload: Every Limit, Every FixCompress images for upload without the bounce: the published caps for Gmail, Outlook, and web forms, plus the fastest route under each one.
- Compress Passport Photo Files to KB LimitsCompress passport photo files to the exact pixel and KB limits US and India visa portals require. Free, no signup, JPEG output, with a cited spec table.
- How to Compress Images for Email (2026 Limits)Gmail caps a message at 25 MB and Outlook at 20 MB or less. How to compress images for email so it actually sends, with the real safe target size.
- How to Compress Images for Website: Every Method That WorksHow to compress images for website: resize to display width, convert to WebP, then compress. Real numbers, a target-size table, and the exact steps.
- How to Compress Images in Excel, Every MethodHow to compress images in Excel: shrink every embedded picture with Compress Pictures, fix photos stuck in a cell, and stop workbooks ballooning.
- How to Compress Images in PowerPoint: All MethodsHow to compress images in PowerPoint: batch every photo with Compress Pictures, pick the right resolution, and shrink audio and video too.
- How to Compress Images in Word, Every MethodHow to compress images in Word: shrink every picture at once, pick the right ppi, stop Word's auto-compression, and see the file-size drop worked out.
- How to Reduce File Size of TIFF Image, Every MethodHow to reduce file size of TIFF image: turn on lossless LZW or ZIP first, then flatten layers, cut bit depth, downsample, or convert to JPEG.
- How to Reduce Image Size for Uploading, TestedHow to reduce image size for uploading: lower quality until the file clears the form's byte cap, then resize separately if it also checks pixels.
Quality and tradeoffs
- Convert Image to High Resolution: The Honest AnswerHow to convert image to high resolution: you can add pixels with interpolation or AI upscaling, but neither recovers detail the photo never captured.
- Does Compressing an Image Reduce Quality?Does compressing an image reduce quality? Only when the compression is lossy. Lossless formats lose nothing, and lossy loss is often invisible at quality 80.
- How to Reduce Image Size Without Losing QualityHow to reduce image size without losing quality: the truly lossless methods, the visually lossless settings, and the real limits, with checkable numbers.
- What Is Image Compression? A Clear, Measured AnswerWhat is image compression? It shrinks a photo's file size by dropping data your eye cannot see. Here is how it works, with real before and after numbers.
- What Is Lossy Image Compression? Lossy vs LosslessWhat is lossy image compression? It discards data for a far smaller file, while lossless keeps every pixel exact. Which formats use each, tested.
JPEG
- Best JPEG Compressor: 6 Tools, TestedThe best JPEG compressor depends on your file. TinyJPG, Squoosh, Compressor.io, JPEGmini, and ImageOptim compared on cost, limits, and privacy.
- Compress JPEG: How the Format Works, MeasuredCompress JPEG files without wrecking them: how the lossy pipeline works, what the quality slider changes, and when to convert to WebP or AVIF instead.
- Convert HEIC to JPG: Every Method, Every DeviceConvert HEIC to JPG on iPhone, Mac, Windows, or Android with the free built-in method for each device, why the JPG is bigger, and when to skip converting.
- How to Compress JPEG Image Files, TestedHow to compress JPEG image files four proven ways: quality, resizing, metadata, and format, with our own measured before and after sizes for each step.
- How to Convert Image to JPG (Every Format, Every Device)How to convert image to jpg from PNG, WebP, HEIC, or RAW: the browser method, Windows and Mac steps, and exactly what the conversion costs you.
- How to Convert PNG Image Into JPG (and When Not To)How to convert png image into jpg using the browser tool, Mac Preview, or Windows Paint, what happens to transparency, and which PNGs to never convert.
- How to Convert RAW Images to JPEG on Any DeviceHow to convert RAW images to JPEG on Windows, Mac, and iPhone, plus free Canon, Nikon, and Sony software for batch exports, and what the JPEG loses.
- How to Reduce JPEG Image Size Without Wrecking ItHow to reduce JPEG image size without visible damage: the safe quality range, resize-first order, progressive JPEG, and where compression starts to show.
- JPG vs JPEG: Is There Really a Difference?jpeg jpg: are they different? No, same 1992 format and bytes. The 8.3 filename history, a byte-level proof, and the one real case that matters.
- Reduce JPEG File Size in KB: Every Method That Hits ItReduce JPEG file size in KB with jpegoptim --size, KB-target tools, or a resize-first approach for tight caps like passport photos under 240 KB.
PNG
- Best PNG Compressor: 5 Tools, MeasuredThe best PNG compressor depends on lossy vs lossless. We measured both on identical PNGs, compared TinyPNG, pngquant, oxipng, Squoosh, and ImageOptim.
- Compress PNG Without Losing TransparencyYes, you can compress PNG without losing transparency. Palette tools like pngquant keep the alpha channel, JPEG destroys it. Here is the byte math.
- Compress PNG: What Actually Shrinks the FileCompress PNG the right way: how PNG compression works, palette vs lossless, what shrinks the file, and when to switch to JPEG or WebP.
- How to Compress a PNG: Two Ways, MeasuredHow to compress a PNG two ways: lossless optimization keeps every pixel, and lossy palette reduction can cut the file by 70 percent or more.
- How to Convert Image to PNG on Any DeviceHow to convert image to PNG using the browser tool, Windows, Mac, or iPhone, plus what the conversion changes and when PNG is the wrong target.
- PNG vs JPG: Which to Use, TestedPNG vs JPG: real KB numbers on a photo and a logo show exactly when each wins, plus transparency, resaving, and where WebP beats both formats.
- Why Are PNG Files So Big? The Byte MathWhy are PNG files so big? PNG is lossless, so it keeps every pixel. Here is what really drives the size up, with the byte math worked out.
WebP and AVIF
- AVIF vs WebP: Which Is Smaller, TestedAVIF vs WebP on the same files: AVIF wins on size at matched quality, WebP wins on encode speed and flat logos. Real byte counts, tested.
- Can ChatGPT Read WebPs? The Documented AnswerCan ChatGPT read webps? OpenAI's own docs list PNG, JPEG, and non-animated GIF only. What happens if you upload one anyway, and how to fix it.
- Can WebP Be Animated? Yes, and It Beats GIFCan WebP be animated? Yes, and it beats GIF: how the frames are stored, the real byte savings (64% lossy), transparency, and browser support.
- Convert JPG to AVIF: Every Method, MeasuredConvert JPG to AVIF with our browser tool, Squoosh, or avifenc, plus a measured size ladder showing how much smaller AVIF really gets on a real photo.
- Does WebP Support Transparency? Yes, and HowDoes WebP support transparency? Yes, in both lossy and lossless modes via an 8-bit alpha channel. How it works, the byte cost versus PNG, and keeping it.
- How to Convert JPG to WebP: Every Method, MeasuredHow to convert JPG to WebP with our browser tool, cwebp, or Preview, plus measured size cuts at each quality and the setting that quietly backfires.
- How to Convert PNG to WebP (Transparency Tested)How to convert PNG to WebP in the browser, with cwebp, or an editor. Tested: transparency survives and a photo dropped 89 percent smaller.
- How to Convert WebP to GIF (and When Not To)How to convert WebP to GIF: the one-click route for an animated file, why the GIF lands bigger, and when a still WebP is better off as a JPG.
- How to Convert WebP to JPG: Every Method That WorksHow to convert WebP to JPG for free with our tool, Windows Paint, or Mac Preview, plus batch tools and what actually breaks along the way.
- How to Convert WebP to PNG (Keep Transparency)Here's how to convert WebP to PNG with our tool, Mac Preview, or Windows Paint, whether renaming works, and what happens to transparency and file size.
- How to Open a WebP File: Every OS and BrowserHow to open a WebP file on Windows, Mac, Linux, Android, and iPhone, browser included, plus the one shortcut that never works.
- How to Save WebP as JPG Without a ConverterHow to save WebP as JPG with Windows Paint or Mac Preview, no converter app, plus the rename trap that fools apps and what happens to transparency.
- Save Discord Emojis as PNG on PC, Not WebPHow to save Discord emojis on PC not as WebP: swap the CDN URL to .png or .gif, or convert the saved file, and keep the transparent background.
- WebP vs JPG (and PNG)WebP vs JPG, settled with real byte counts: WebP runs 25 to 34% smaller plus transparency and animation, but JPG still wins where WebP gets rejected.
- What Is a WebP File? The Complete AnswerWhat is a WebP file? Google's web image format that beats JPEG and PNG on size, with the real numbers and when it backfires instead.
- What Is AVIF? The AV1 Image Format, MeasuredWhat is AVIF? The AV1 Image File Format runs about 50% smaller than JPEG, with transparency, HDR, and animation. How it works and where it falls short.
- What Is WebP and AVIF? Sizes, Support, SafetyWhat is WebP, and what is AVIF? How much smaller they are than JPEG and PNG, browser support, safety, and when to use each, with measured sizes.
- Why Do Images Save as WebP (and How to Stop It)Why do images save as webp instead of jpg or png? The Accept header mechanism proven with a real request, plus the honest fix for every browser.
What apps and platforms do to your images
- Does Bluesky Compress Images? Yes, Twice (Tested)Does Bluesky compress images? Yes, twice. My 4.13 MB test photo came back a 1.56 MB WebP at 4000x3000, 62.3% smaller. Tested 2026-07-18.
- Does Canva Compress Images? Every Export, MeasuredDoes Canva compress images? On export, yes. My 4.13 MB photo came back at 2.34 MB as a JPG and 18.21 MB as a PNG. Dated test, four exports.
- Does Discord Compress Images? Tested Byte by ByteDoes Discord compress images? Barely, my dated test shows: a PNG came back byte identical, a JPEG lost 0.3%. Size caps, mobile settings, real fixes.
- Does Dropbox Compress Images? No, Verified by HashDoes Dropbox compress images? No. Tested 2026-07-18: both files came back sha256 identical. The compressed look comes from previews, not storage.
- Does Facebook Compress Images? Two Files, MeasuredDoes Facebook compress images? Yes, hard: my 4.13 MB photo came back 86.3% smaller at 2048px, and a transparent PNG became a JPEG. Tested 2026-07-18.
- Does Figma Compress Images? I Measured the ExportsDoes Figma compress images? Not on import under 4096px. Exports grew my 4.13 MB photo to 10.78 MB as a JPG and 19.60 MB as a PNG. Dated test.
- Does Gmail Compress Images? Attach vs Inline, MeasuredDoes Gmail compress images? Attached photos arrived byte for byte identical. The same photo inserted inline lost 55.1% of its bytes. Tested 2026-07-18.
- Does Google Drive Compress Images? I Tested It TwiceDoes Google Drive compress images? No. My 4.13 MB photo and 1.78 MB PNG came back byte identical, same sha256 hash. Tested 2026-07-18.
- Does Google Photos Compress Images? Both Modes TestedDoes Google Photos compress images? Storage saver took 35.1% off my 4.13 MB photo. Original quality gave back identical bytes. Dated test, both modes.
- Does Google Slides Compress Images? Yes. I Measured ItDoes Google Slides compress images? Yes: my 4.13 MB photo came back 77.8% smaller at 2048x1536, and a smaller PNG passed untouched. Tested 2026-07-18.
- Does Imgur Compress Images? It Made Mine BiggerDoes Imgur compress images? I uploaded a 4.13 MB photo on 2026-07-18 and got 4.80 MB back, 16.1% larger, EXIF stripped. The PNG shrank 18.8%.
- Does Instagram Compress Images? One Upload, MeasuredDoes Instagram compress images? Yes, but gently in my test: a 4.13 MB iPhone photo came back 5.4% smaller at full size, EXIF gone. Tested 2026-07-18.
- Does LinkedIn Compress Images? Yes, by 99.5% (Tested)Does LinkedIn compress images? Yes, always. My 4.13 MB test photo came back a 22.0 KB JPEG at 480x360, 99.5% smaller, EXIF gone. Tested 2026-07-18.
- Does Microsoft Teams Compress Images? Yes, by 5.7%Does Microsoft Teams compress images? Tested 2026-07-18: my 4.13 MB photo came back 3.90 MB, 5.7% smaller, all 4032x3024 pixels kept, EXIF stripped.
- Does Microsoft Word Compress Images? I Tested ItDoes Microsoft Word compress images? Docs say yes, 220 ppi by default, but my 4.13 MB photo came back byte identical. Tested and explained, 2026-07-18.
- Does Outlook Compress Images? Inline Yes, Attached NoDoes Outlook compress images? Attached photos arrived byte for byte identical. Inline shrank 80.6% to 1920x1440, EXIF stripped. Tested 2026-07-18.
- Does PDF Compress Images? Two Exporters, TestedDoes PDF compress images? The format never does, the exporter decides. LibreOffice cut my photo 71.1%, img2pdf changed nothing. Tested 2026-07-18.
- Does Pinterest Compress Images? Yes, by 59%, TestedDoes Pinterest compress images? Yes: my 4.13 MB photo was stored 58.9% smaller with EXIF kept, and the feed gets a 736px copy. Tested 2026-07-18.
- Does Slack Compress Images? Mine Came Back BiggerDoes Slack compress images? I sent a 4.13 MB photo through on 2026-07-18 and got 4.58 MB back, 10.9% larger, EXIF stripped, pixels untouched.
- Does Twitter Compress Images? Yes, and X Keeps Two CopiesDoes Twitter compress images? Yes, but X keeps two copies: my stored photo shrank 8.5%, the timeline copy 81.5%. Tested 2026-07-18.
- Does WhatsApp Compress Images? My Byte-for-Byte TestDoes WhatsApp compress images? Chat photos, yes. But the photo I sent as a document came back byte for byte identical, same sha256. Tested 2026-07-18.
- Which Apps Compress Images, Measured and ComparedWhich apps compress images best on phone, desktop, and the web, and which platforms quietly re-encode your uploads. A measured, no-install comparison.
Converting between formats
- Convert a Scanned Image to PDF: Every Free MethodHow to convert scanned image to PDF free on Windows, Mac, iPhone, and Android, plus OCR to make it searchable and a size fix before you send it.
- How to Convert a Color Image to Black and WhiteHow to convert a color image to black and white on your phone, Mac, Photoshop, or Office, plus what it does to file size and how to keep the color.
- How to Convert Image to Excel: 4 Methods That WorkHow to convert image to Excel with Data from Picture, the Microsoft 365 mobile app, an online OCR tool, or ChatGPT, plus which one to trust with your data.
- How to Convert Image to PDF (Every Free Method)How to convert image to pdf on Windows, Mac, iPhone, and Android, or online, plus the one step that keeps the resulting PDF small too.
- How to Convert Image to PDF on iPhone, No AppHow to convert image to PDF on iPhone with no app: save the photo to Files and tap Create PDF, or print it and pinch the preview into a PDF.
- How to Convert Image to SVG: 3 Real MethodsConverting an image to SVG means tracing it. Here is how to convert image to SVG free in Inkscape, in Illustrator, or online, and when tracing fails.
- How to Convert Image to Text: Every Free MethodHow to convert image to text free: OCR built into iPhone, Windows, and Mac, plus Google Drive, Docs, and Lens, with an honest handwriting verdict.
- How to Convert Image to Vector: 6 Real MethodsHow to convert image to vector: trace it in Illustrator, free Inkscape, Photoshop, Canva, or online, plus why photos fail and when to redraw by hand.
- How to Convert Images to PDF (Multiple Files at Once)How to convert images to pdf as one file: combine photos on Windows, Mac, or Acrobat, in order, without losing quality or size.
- How to Convert Images: PDF, SVG, Vector, TextHow to convert images depends on the job: PDF wraps a print page, SVG needs tracing, text needs OCR. The right free route for each, and what works.
- How to Convert PDF to Image (Every Free Method)How to convert PDF to image files on Mac, Windows, iPhone, or online, plus which format to pick, the privacy trap to avoid, and when not to bother.
- How to Convert Word to Image: 4 Methods, MeasuredHow to convert Word to image with Paste Special, the Snipping Tool, an online converter, or the PDF route, plus which format saves the smallest file.