Privacy & security
Can You Compress Images Online Without Uploading Them?
Understand the difference between local processing and server uploads, then compress a batch safely in your browser.
Read guide →Image Compression & Format Guides
From choosing a format to shrinking files without obvious damage, these guides pair practical settings with the reasoning behind them.
Open the image compressorFormat choice
JPG vs PNG vs WebP vs AVIF: How to Choose
A practical comparison of four common image formats, including the trade-offs that matter in real workflows.
Read guide →Web performance
How to Compress Website Images Without Making Them Look Bad
Build a reliable web-image workflow from source dimensions through responsive delivery without sacrificing clarity.
Read guide →iPhone photos
How to Convert HEIC to JPG Without Uploading Photos
Turn iPhone HEIC photos into universal JPG files while understanding what conversion preserves and changes.
Read guide →Lossless & alpha
How to Compress PNG Without Ruining Transparency or Text
Separate truly lossless optimization from lossy palette reduction and protect transparent edges.
Read guide →Batch workflow
How to Batch-Compress an Image Folder Without Chaos
A reviewable folder workflow that keeps originals safe and catches quality mistakes before they spread.
Read guide →Compression basics
Image Quality vs File Size: What Quality and SSIM Mean
Why the same quality value behaves differently across images, and what an SSIM-guided search actually solves.
Read guide →Dimension planning
How to Resize Images for Email, Websites, and Sharing
Work backward from the destination and remove unused pixels before lowering quality.
Read guide →Photography workflow
How to Turn RAW and TIFF Files Into Web-Friendly Images
Generate lightweight delivery images from high-quality masters without replacing the RAW/TIFF originals.
Read guide →Troubleshooting
Why Do Compressed Images Look Blurry? 7 Causes and Fixes
Turn “blurry” into a specific symptom and fix the real dimension, format, or encoding problem.
Read guide →How the tool works
What Is Smart Auto Image Compression and When Is It Better?
Compare fixed quality with per-image adaptation and learn what Smart auto still cannot decide for you.
Read guide →File-size target
How to Compress an Image to a Target KB or MB Limit
Turn a target-size request into a repeatable three-pass workflow instead of guessing a quality number.
Read guide →Major reduction
How to Compress a Photo from MB to KB—and Know When the Target Is Unrealistic
For a major reduction, remove unused content and pixels before deciding how much visual quality can be traded.
Read guide →Applications & forms
How to Compress an Image That an Online Form Rejects
A form upload is not a smallest-file contest: satisfy the rules while protecting names, numbers, dates, and stamps.
Read guide →Product imagery
How to Compress Ecommerce Product Images Without Losing Important Detail
Process thumbnails, main images, and detail views separately instead of forcing one setting across every product asset.
Read guide →Website workflow
How to Compress and Resize Images Before Uploading to WordPress
Work from the theme’s real rendered width instead of uploading oversized originals and hoping later processing is ideal.
Read guide →Screenshots & tutorials
How to Compress Documentation and Code Screenshots Without Blurry Text
A screenshot is not a photo: protect type edges, code punctuation, and thin interface lines first.
Read guide →Scans & receipts
How to Compress Scans, Receipts, and Document Images Without Losing Readability
Fix scan quality before compression; an unreadable small file is not a successful document.
Read guide →Large images
How to Compress 4K and Very Large Images Without Browser Memory Failures
The challenge is not only file megabytes: decoded pixels and intermediate buffers consume much more memory.
Read guide →Core concept
Lossless vs Lossy Image Compression: What Is the Difference?
“Lossless” describes recoverable pixels; it does not promise the smallest file or merely mean “looks the same to me.”
Read guide →Format conversion
How to Convert Canon CR2 or CR3 RAW Files to JPG
Drop a CR2 or CR3 file in directly and decode it locally into a common format — no viewer software required first.
Read guide →Format conversion
How to Convert Nikon NEF RAW Files to JPG
Drop an NEF file in directly and decode it locally — no photo taken leaves your device.
Read guide →Format conversion
How to Convert Sony ARW RAW Files to JPG
Drop an ARW file in directly and decode it locally — no photo leaves your device.
Read guide →Format conversion
How to Convert a GIF to PNG or JPG
Turn an animated or screenshot-style GIF into a smaller static PNG or JPG, entirely in your browser.
Read guide →Format conversion
How to Convert a BMP File to JPG or PNG
Turn a bloated BMP bitmap into JPG or PNG in your browser — no viewer software needed.
Read guide →Compression concepts
What Is PNG Quantize, and When Should You Use It?
Understand what the "PNG size optimization" toggle actually does, and when to use it.
Read guide →Use case
How Should You Compress Images Before Posting to Social Media?
Prep images before uploading to reduce quality loss from a platform's own re-compression.
Read guide →Use case
How Should You Compress Resume Attachments and Professional Headshots?
Compress resume images and professional headshots to a reasonable size while keeping them looking sharp.
Read guide →Use case
How Should You Compress Images for a WeChat Article?
Compress article images to a size that keeps mobile readers happy and load times fast.
Read guide →Use case
How Do You Batch-Convert a Full Shoot of RAW Photos?
Batch-convert a full shoot of RAW files into a JPG set ready for client delivery.
Read guide →Format choice
How Good Is AVIF Browser and Software Compatibility?
Understand when AVIF is safe to use today, and when JPG or WebP is the safer choice.
Read guide →Troubleshooting
Why Does the Browser Freeze When Compressing Very Large Images?
Diagnose why the browser slows down or freezes on huge images or large batches, and learn to split the work.
Read guide →Automation
How Does Folder Automation Work?
Pick an input and output folder, and new files get discovered, compressed, and written out automatically.
Read guide →Compatibility
Which Browsers Support Folder Automation?
Find out whether folder automation works in your browser, and what happens if it doesn't.
Read guide →How-to
How Do You Set Up Automatic Folder Compression?
Follow these steps to set up folder automation — first-time setup takes a couple of minutes.
Read guide →Feature choice
Folder Automation vs. Manual Drag-and-Drop: Which One Fits?
Decide between folder automation and manual drag-and-drop based on how often you actually compress images.
Read guide →Compression concepts
Why Can Several Images Compress at the Same Time?
Understand why batch image compression handles several files at once instead of queuing them one by one.
Read guide →Batch processing
What Happens When You Drag In a Folder With Nested Subfolders?
Drag in a folder with several levels of subfolders and see how every image inside gets picked up.
Read guide →Compression settings
What Does the "Auto" Output Format Option Do?
Understand exactly what format each image ends up as when output is set to "auto."
Read guide →Compression settings
How Does the Target SSIM Slider in the Custom Panel Work?
Understand what the target SSIM slider does once "auto quality" is turned on in the custom panel.
Read guide →Compression concepts
What Does the oxipng Level Setting Control?
Understand what the oxipng level parameter behind PNG compression actually does, and how it differs from lossy quantization.
Read guide →Troubleshooting
Why Is a Compressed File Larger Than the Original?
Understand what a "file grew" result means, and how to fix it.
Read guide →Batch processing
How Is the Batch ZIP Download Organized?
Know how files are named and organized in the ZIP before downloading a large batch of compressed results.
Read guide →Workflow tip
How Do You Change Settings Without Re-Uploading?
After adjusting settings, recompress an already-processed file directly instead of dragging it in again.
Read guide →Format conversion
How to Convert Fujifilm RAF RAW Files to JPG
Drop a RAF file in directly and decode it locally — no photo leaves your device.
Read guide →Format conversion
How to Convert Panasonic RW2 and Olympus ORF RAW Files to JPG
Drop an RW2 or ORF file in directly and decode it locally — no photo leaves your device.
Read guide →Reference
What Image Formats Does This Tool Support? The Full List
See every supported input format (including niche camera RAW) and output format in one place.
Read guide →Use case
How Should You Compress App Store Screenshots?
Compress app store screenshots to a reasonable size while keeping on-screen text and UI detail sharp.
Read guide →Use case
How Should Print and Web Images Be Compressed Differently?
Understand why the same image needs a different compression strategy for print delivery versus web display.
Read guide →Compatibility
Can You Compress Images Normally in a Mobile Browser?
Know what works and what's limited before compressing images on your phone's browser.
Read guide →FAQ
Is There a Limit on How Many Images or How Large a File You Can Compress?
Understand whether there's a count or size limit, and where the real limits actually come from.
Read guide →Use case
How Should You Compress Photos for a Real Estate Listing?
Compress a full set of listing photos to a size that suits both platform upload requirements and buyer browsing.
Read guide →