Antiloom Image Compressor
Shrink JPG, PNG and WEBP files in your browser — batch processing, target-size mode, resize presets and a live before/after comparison. Nothing ever leaves your device.
Drop images here, or click to browse
JPG, PNG, WEBP or GIF · up to 30 images at once
Why Compress Images Before You Upload or Share Them
Most photos straight out of a phone camera or a design tool like Canva and Photoshop weigh between 3MB and 12MB. That is far more data than a web page, a WhatsApp chat, a blog post, or a college assignment upload form actually needs. Large images slow down page loading, eat into mobile data, and often get rejected outright by upload forms that cap file size at 1MB or 2MB. The Antiloom Image Compressor exists to solve that one problem well: it takes your images and reduces their file size while keeping them visually sharp, without asking you to install anything or create an account.
How the Antiloom Compressor Works
This tool does not send your photos to a server. Every step — reading the file, resizing it, and re-encoding it at a lower file size — happens directly inside your browser using the HTML5 Canvas API. That has a few practical benefits worth knowing about:
- Your images stay private. Nothing is uploaded, so there is no waiting for a server round-trip and no copy of your photo sitting on someone else's storage.
- It starts instantly. As soon as you drop a file in, the browser can begin working on it — there is no upload queue to sit through.
- It works on slow or limited connections. Because no data leaves your device during compression, the tool is friendly to slower mobile networks, which matters if you are compressing images on the go.
- EXIF and location metadata are typically dropped. Re-encoding an image through canvas normally strips embedded camera and GPS metadata, which is a welcome side effect if you plan to share the photo publicly — though the exact behaviour can vary slightly between browsers.
Batch Compression, One Setting for the Whole Set
You are not limited to one image at a time. Drop or select up to 30 photos together, choose your quality or target-size setting once, and click Compress All Images. Antiloom processes the whole batch, gives each image its own card with a live before-and-after comparison slider, and shows exactly how many kilobytes you saved on that file. When every image is done, a summary bar reports the total space saved across the batch, and a single Download All as ZIP button bundles everything into one file so you are not clicking "save" dozens of times.
Quality Mode vs. Target Size Mode
Two different people usually want two different things from a compressor, so Antiloom offers both approaches:
- By Quality lets you pick a percentage on a slider and lets the resulting file size fall wherever it falls. This is the faster option when you simply want "smaller, but still sharp," and you can watch the before/after slider update as you compress.
- By Target Size lets you type an exact KB limit — say, 100KB for a form that rejects anything bigger — and the tool automatically tests a range of quality levels behind the scenes until it lands as close as possible to your number.
Choosing the Right Output Format
| Format | Best for | Notes |
|---|---|---|
| JPG | Photos, wallpapers, thumbnails | Smallest file sizes; does not support transparency |
| WEBP | Websites, general sharing | Usually smaller than JPG at the same visual quality; supports transparency |
| PNG | Logos, screenshots, graphics with transparent backgrounds | Lossless — the quality slider will not shrink it further, only resizing will |
If you are not sure which to pick, leave the format on Auto. Antiloom will keep each photo in its original format and only adjust quality and dimensions.
Resizing to Standard Sizes
Turning on the resize option lets you fit every image in your batch to a fixed size while it compresses, which is useful for keeping a set of images consistent for a specific platform:
- YouTube Thumbnail (1280 × 720) — the dimensions YouTube recommends for thumbnails.
- Reels / Shorts (1080 × 1920) — the standard vertical 9:16 frame used across Reels, Shorts, and TikTok.
- Square Post (1080 × 1080) — a common square format for feed posts.
- Custom — enter any width and height in pixels you need.
With Keep aspect ratio switched on, each photo is scaled to fit neatly inside your chosen box without stretching or distorting it. Switch it off only if you need an exact pixel size and do not mind minor stretching to fill it.
Step-by-Step Guide: How to Compress an Image with Antiloom
- Drop one or more images into the upload area, or click it to browse your files.
- Choose By Quality if you want visual control, or By Target Size if you need to hit an exact KB limit.
- Pick an output format — JPG or WEBP work well for photos, PNG for graphics that need transparency.
- Optionally turn on resize and pick a preset, or enter a custom width and height.
- Click Compress All Images, then drag the slider on any card to compare it against the original.
- Download a single image with the download link on its card, or click Download All as ZIP to save the whole batch at once.
When Should You Use an Image Compressor?
A few everyday situations where shrinking an image first makes a real difference:
- Uploading a photo or ID to a government or job portal that enforces a strict size limit, often under 200KB or 500KB.
- Sending photos over WhatsApp or email without the platform's own automatic compression destroying the quality.
- Publishing images on a blog or website, where every extra megabyte adds to page load time and can hurt search rankings.
- Preparing thumbnails or cover art for YouTube, Instagram, or a course platform that expects a specific pixel size.
- Freeing up phone or cloud storage by keeping a lighter copy of large photo libraries.
Frequently Asked Questions
Does Antiloom upload my photos anywhere?
No. Every step of compression happens inside your own browser using JavaScript and the Canvas API. Your files are never sent to a server or stored anywhere outside your device.
Can I compress more than one image at a time?
Yes. You can select or drag in up to 30 images at once, and the same quality, format, and resize settings will be applied to the entire batch in a single click.
Will compressing an image reduce its quality?
It depends on the format. PNG output is genuinely lossless, so nothing is discarded beyond what resizing removes. JPG and WEBP are quality-based formats — at 75–90% quality most people cannot spot a difference from the original, but the file is not byte-for-byte identical to it.
Why is my target size not landing exactly on the number I typed?
Target Size mode searches for the closest quality level it can find in a limited number of attempts, so the final file will usually be very close to — but not always exactly — the number you entered. PNG files ignore the target size setting entirely, since PNG compression is lossless rather than quality-based.
Is there a limit on file size or number of images?
You can work with up to 30 images per batch. Very large source photos (well above 20MB) may take a little longer to process since everything runs on your own device's processor rather than a server.
