Compress images in bulk,even whole folders
Make JPG, PNG, WebP and AVIF images up to 80% smaller right in your browser. Free, private, and nothing is ever uploaded.
- No upload
- Free, no sign-up
- Whole folders
- Works offline
Drop images or a folder here
JPG, PNG, WebP, AVIF or BMP · no file limit
Processed on your device. Nothing is uploaded.
How it works
Three steps, no account, and your images never leave your computer.
- Step 1
Add images or a folder
Drag files or a whole folder onto the page, or use the buttons. Subfolders are included automatically.
- Step 2
Compression starts instantly
Smart defaults work for most images. Change format, quality or size at any time and apply again.
- Step 3
Check and download
Compare before and after, then download everything as one ZIP – or save straight back to your folder.
Why people use Asset Compressor
100% private
Compression runs in your browser with WebAssembly. No uploads, no servers, no copies of your photos anywhere.
Built for folders
Process hundreds of images across nested subfolders. The ZIP keeps your folder structure and file names.
Never bigger
If an image is already optimal, the original is kept byte-for-byte. You never get a file that’s larger than before.
Pro-grade encoders
MozJPEG, libwebp, OxiPNG and libavif – the same engines used by professional image pipelines.
Convert & resize
Switch to WebP or AVIF, cap the width for the web, or hit a target file size like 100 KB.
Works offline
Install it as an app. Once loaded, it keeps working without an internet connection.
More free tools, same privacy
Everything runs in your browser – nothing is uploaded, ever.
AI background remover
Cut out people and products in seconds with an AI model that runs on your device. Transparent PNG, white or blurred background, full resolution.
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Video compressor
Shrink MP4, MOV, WebM and MKV videos with hardware acceleration – by quality or to an exact size for Discord, WhatsApp or email.
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Video converter & resizer
Convert between MP4, WebM, MOV and MKV (lossless when possible), resize for Reels and TikTok, or extract MP3 audio.
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Which format should I choose?
Not sure? Pick WebP – it’s smaller than JPEG and PNG and works in every modern browser.
Frequently asked questions
Are my images uploaded to a server?
No. Asset Compressor runs entirely in your browser using WebAssembly encoders and Web Workers. Your images never leave your device – once the page has loaded, you can even disconnect from the internet.
Is Asset Compressor really free? Are there limits?
Yes, it is free with no sign-up, no watermarks and no file-count limits. Because your own device does the work, the only limit is your browser’s memory – folders with hundreds or thousands of images work fine on a typical laptop.
Can I compress a whole folder, including subfolders?
Yes. Choose “Select folder” or drag a folder onto the page. Every supported image in every subfolder is processed, and the ZIP download keeps the same folder structure.
Can Asset Compressor overwrite the original files?
In Chrome, Edge and other Chromium browsers you can save results straight back into the folder you opened, either replacing the originals or into a new subfolder. Other browsers download a ZIP instead. Keep a backup before replacing originals.
What if an image gets bigger after compression?
When you keep the original format and size, Asset Compressor never gives you a larger file: if re-encoding doesn’t help, the original is kept byte-for-byte and marked “Already optimized”.
Which formats are supported?
You can open JPG/JPEG, PNG, WebP, AVIF and BMP files, and save as JPEG, PNG, WebP or AVIF. HEIC, GIF and SVG are not supported yet. The video tools handle MP4, MOV, WebM and MKV, plus older formats like AVI in compatibility mode.
Which format should I choose?
For websites, WebP is the best all-round choice: small, fast to encode and supported everywhere. AVIF is smaller still but slower to encode. Keep JPEG for maximum compatibility and PNG when you need lossless output.
Can Asset Compressor compress videos or remove backgrounds too?
Yes. The video tools compress, convert and resize MP4, MOV, WebM and MKV files using your device’s hardware video encoder, and the background remover cuts out subjects with an AI model that runs in your browser. Like the image compressor, neither uploads your files.
Does compression remove photo metadata (EXIF)?
Re-encoded images do not keep EXIF metadata such as camera details or GPS location. Files kept unchanged because they were already optimal keep their metadata.
Guides and tips
Practical answers about image formats, file sizes and video quality.
How to reduce JPEG file size without making the photo look worse
Resolution, quality, encoder and metadata explained – plus how to hit an exact limit such as 100 KB or 1 MB for upload forms.
How to send a video without losing quality
Why messaging apps make your videos blurry, and the best way to share a clip by chat, email, Discord or a link – depending on its size.
How to remux MKV to MP4 – and when you have to re-encode
Container versus codec explained: why MKV to MP4 usually takes seconds and loses nothing, and why AVI, WMV, FLV and MPG need re-encoding.
How to extract audio from a video (and save it as MP3)
Bitrates, trimming and large recordings explained – turn lectures, interviews and performances into small MP3 files on your own device.
How to crop photos online without losing quality
Aspect ratios, the right order of crop and resize, and how to crop a whole folder to the same shape – all privately in your browser.
WebP vs AVIF vs JPEG vs PNG: which image format should you use?
File size, quality, transparency and compatibility compared – with a simple rule for picking the right format every time.
All free tools
Compress images
Make JPG, PNG and WebP files smaller without visible quality loss.
Compress JPEG
Shrink JPG photos with the MozJPEG encoder while keeping them sharp. Drop a single photo or an entire folder – nothing is uploaded.
Compress PNG
Re-pack PNGs losslessly with OxiPNG – every pixel stays identical. Need a much smaller file? Switch the output to WebP in one click.
Compress WebP
Re-encode WebP files with Google’s libwebp at the quality you choose, in bulk, without uploading anything.
Convert images
Switch between JPG, PNG, WebP and AVIF – one file or whole folders.
PNG to WebP
Turn heavy PNGs into lightweight WebP files that keep their transparency. Convert one file or a whole folder at once.
JPG to WebP
Convert JPEG photos to WebP for smaller, faster-loading images at the same visual quality – in bulk and without uploading.
WebP to JPG
Need a JPG that works everywhere? Convert WebP images to high-quality JPEG in bulk, right in your browser.
WebP to PNG
Convert WebP images to lossless PNG files with transparency intact – ideal for editing, design tools and platforms that need PNG.
PNG to JPG
Photos saved as PNG are often huge. Convert them to JPG for dramatically smaller files that open anywhere.
Convert to AVIF
AVIF delivers the smallest files of any widely supported image format. Convert JPG, PNG or WebP to AVIF in bulk, locally on your device.
Resize images
Scale photos down in bulk or hit an exact file size such as 100 KB.
Resize images
Set a maximum width or height and every image is scaled down proportionally – and compressed at the same time.
Compress to 100 KB
Upload forms often demand images under a size limit. Set a target and Asset Compressor finds the highest quality that fits – for every image in the batch.
Compress to 20 KB
Application portals often want a signature or ID photo under 20 KB. Drop your image in and Asset Compressor shrinks it below the limit at the best quality that still fits.
Compress to 50 KB
A 50 KB limit is the most common rule for application photos. Asset Compressor resizes and compresses your picture so it lands just under 50 KB while looking as good as possible.
Compress to 200 KB
200 KB is enough for a sharp full-HD photo – and small enough for most upload forms, emails and web pages. Set it once and every image in your batch fits.
Compress to 500 KB
A 500 KB budget leaves room for high-resolution, detailed photos. Asset Compressor keeps up to 2560 px and fits every image in your batch under half a megabyte.
Compress to 1 MB
Phone photos are often 3–10 MB – too big for many upload forms. Bring them under 1 MB at up to 4K resolution, so they still look great when someone zooms in.
Image editing
Crop photos, apply filters and remove backgrounds with AI – private photo editing in your browser.
Crop image
Draw the exact area you want to keep, or crop a whole batch to one shape in a single pass. Your photos are cropped on your own device and never uploaded.
Crop to square
Turn landscape and portrait photos into perfect squares. Every image is centered automatically, and you can move the square by hand wherever the subject is off-center.
Remove background
Cut out people, products and pets automatically. The AI runs on your own device, so your photos are never uploaded – and downloads are full resolution, with no watermark.
Black & White
Transform your photos into classic monochrome or high-contrast black and white. Drop a single picture or a whole folder – everything is processed in your browser.
Sepia Filter
Give your images a warm, nostalgic sepia tone. Perfect for family portraits, architecture shots and retro photo albums – one photo or a whole folder.
High Contrast
Bring out detail, deepen shadows and make colors pop across your photos. Everything runs privately on your device.
Video tools
Compress, convert and resize videos with hardware acceleration.
Compress video
Shrink MP4, MOV, WebM and MKV files on your own device with hardware-accelerated encoding. Choose a quality level or an exact target size – no upload, no watermark.
Video for Discord
Discord blocks free uploads above its size limit. Set a target and every clip is squeezed to fit at the best quality possible – right in your browser.
Video to 25 MB
Upload forms and email attachments stop at around 25 MB. Set the size, and Asset Compressor works out the bitrate and resolution that give the best picture under the limit.
Video to 50 MB
50 MB is enough for several minutes of sharp HD video. Drop in a long recording or a 4K clip and get an MP4 that fits – without uploading it to anyone’s server.
Video converter
Change a video’s format in seconds. When the codecs allow it, the streams are copied without re-encoding, so the quality stays exactly the same.
Resize video
Scale videos down to 1080p, 720p or 480p, or fit them to an exact frame like 9:16 for Reels and TikTok – with letterboxing or a clean crop.
MOV to MP4
iPhones and QuickTime save videos as MOV. Turn them into MP4 files that play on Windows, Android and every website – usually without re-encoding.
WebM to MP4
WebM files from screen recorders and browsers often won’t open in editors, on iPhones or in PowerPoint. Convert them to universally compatible MP4 in your browser.
MP4 to WebM
WebM with VP9 or AV1 is built for the web: smaller files at the same visual quality, supported by every modern browser. Convert your MP4s locally.
MKV to MP4
MKV is great for storing video but many TVs, phones and editing apps won’t open it. Remux it to MP4 in seconds without touching the picture quality.
AVI to MP4
AVI files from old cameras, DivX and Xvid downloads or Windows-era recordings often won’t play on phones or in browsers. Convert them to MP4 right on your device.
WMV to MP4
WMV was the standard on Windows for years, but Macs, iPhones and many apps no longer open it. Convert Windows Media Video to MP4 without uploading anything.
FLV to MP4
Flash is gone, but many saved videos and old recordings are still FLV files. Convert them to MP4 so they play again on phones, computers and TVs.
3GP to MP4
Videos from older mobile phones were saved as 3GP. Bring those memories back by converting them to MP4 – quickly, privately and without installing anything.
MPG to MP4
MPG files from camcorders, TV recorders and old video CDs are big and awkward to play. Convert them to MP4 – usually much smaller at the same quality.
AVI to WebM
Need an old AVI clip on a website? Convert it to WebM with VP9 video and Opus audio – the open, royalty-free format every modern browser plays.
Video to MP3
Save the soundtrack, a podcast recording or a voice memo from any video as an MP3 file that plays everywhere – processed entirely on your device.
MP4 to MP3
Turn MP4 videos into MP3 audio you can play in the car, on any phone or in a podcast app. Conversion takes seconds and happens entirely on your device.