What is Image Compression?

Image compression is a process for optimizing images by encoding or converting a graphics file in a way that it will consume less storage space than the original one. It is a type of technique to compress image, using an image compressor tool without influencing or degrading the image quality to a greater extent.

What is the need for Image Compression?

Image Compression helps in website optimization i.e. reducing the time taken to load a website,it helps in cases where while uploading image, file size is restricted by certain types of servers, and finally it helps in reducing the storage impact on your hard drive.

Is it safe to use a free image compression tool?

All compression takes place in the browser itself and no data is taken to our servers for any kind of processing. The same holds for our QR code generator that builds the code entirely in your browser .

How many images can I compress at a time?

We allow multiple images to be uploaded and compressed in a single go.

Is this image compression tool a honey pot?

Here at BlockSurvey, we give at most importance to privacy which is consistent with our vision of a world having a decentralized internet space. As already mentioned above, the tool does not collect and store any form of data given to it. It simply acts as a platform for people to enter their images and get them compressed.

The product is built from already existing open source code with slight tweaks by us. It was primarily built for compressing images in our own product i.e. BlockSurvey and at a certain point we had this idea of sharing the benefits accruing from this project with the rest of the world.

What are the modules used to build this?

The tool uses a npm module called browser-image-compression

How does image compression tool work?

The tool reads the data from the HTML file reader API and uses the browser-image-compression module to process it. The browser-image-compression module creates an HTML canvas element and draws the image on it and gets the scaled down data back from the canvas. The returned dataURI is read, decoded from Base64 and displayed to the user.

How is this different from a paid image compression tool?

The compression itself is the same category of work either way: lossy re-encoding to shrink file size. The difference is where that work happens. Most free and paid compressors, including TinyPNG-style tools, upload your image to their server, compress it there, and send back the result. That is fine for a random image you found online, but it is not something you want to do with an ID scan, a medical image, or an internal screenshot. This tool runs the same kind of compression (the browser-image-compression library, drawing on an HTML canvas) entirely in your browser, so the file never leaves your device. There is also no account, no per-image limit, and no monthly cap.

Does compression strip EXIF metadata from my photos?

In most cases, yes, though that is a side effect of how the tool works rather than a dedicated feature. Because compression happens by drawing the image onto an HTML canvas and reading the pixel data back (see how it works above), metadata blocks such as camera model, GPS coordinates, and timestamps embedded in the original file typically do not carry over to the compressed output. If you need a guarantee that a specific photo has no location data attached before you share it, check the downloaded file with an EXIF viewer rather than relying on this as a dedicated stripping tool.

Privacy-focused image compression

BlockSurvey's free image compression is a privacy-focused tool. Simply upload your image and image compression tool will work out the magic for you.

or drag and drop an image

It works for JPG, JPEG and PNG formats

Know how the privacy-focused image compression works

01
Step 1 : Upload image files
Upload the image files you would like to compress.
02
Step 2 : Process files using browser image compression
The uploaded images are fed to the browser-image-compression module which processes them and returns the compressed images.
03
Step 3 : Download Compressed Images
Download the compressed images. You can also clear the list and go for fresh set of uploads.

Private by design: nothing leaves your browser

The photos people compress here are often the ones they care most about keeping private: ID scans, medical images, internal screenshots, personal photos. Uploading those to a random compressor's server just to shrink a file size hands them over for no good reason. This tool was built so that cannot happen:

01
100% client-side
Compression runs through the browser-image-compression library, which draws your image onto an HTML <canvas> on your device and reads the scaled-down data back from it. No image bytes are ever uploaded anywhere, which you can confirm for yourself in your browser's network tab.
02
Nothing stored or logged
There is no account and no history. Your images live only in the page's memory and are gone the moment you close the tab or reload the page.
03
Works offline
Once the compression library has finished loading, you can disconnect from the internet and keep compressing images. If a server were doing the work, it would stop the moment you went offline.

Built for developers and security-conscious teams

Anyone who needs a smaller image without handing it to a third-party server. BlockSurvey takes the same position on survey data with zero-knowledge surveys, where responses are encrypted before they ever reach a server.

01
Sensitive uploads
ID scans, medical images, and internal screenshots that need a smaller file size without touching a third-party server along the way.
02
Developers
Shrink images for a site or app before upload, without wiring up a server-side compression step or an API with a rate limit.
03
Everyday sharing
Privacy-conscious users compressing personal photos before sending them over email or messaging apps that choke on large files.

Building something that handles sensitive data?

BlockSurvey runs on zero-knowledge surveys, so the responses you collect are never sold or mined. Responses are encrypted on the respondent's device, so the server stores nothing readable.

More free privacy tools

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Encryption and decryption toolEncrypt or decrypt text with AES-256-GCM. The message and passphrase never leave your browser.

These tools run in your browser and keep what you enter on your device. When you need to collect answers from other people the same way, use privacy-first survey software.

Frequently Asked Questions

: Image compression is a process for optimizing images by encoding or converting a graphics file in a way that it will consume less storage space than the original one. It is a type of technique to compress image, using an image compressor tool without influencing or degrading the image quality to a greater extent.
: Image Compression helps in website optimization i.e. reducing the time taken to load a website,it helps in cases where while uploading image, file size is restricted by certain types of servers, and finally it helps in reducing the storage impact on your hard drive.
: All compression takes place in the browser itself and no data is taken to our servers for any kind of processing. The same holds for our QR code generator that builds the code entirely in your browser.
: We allow multiple images to be uploaded and compressed in a single go.
: Here at BlockSurvey, we give at most importance to privacy which is consistent with our vision of a world having a decentralized internet space. As already mentioned above, the tool does not collect and store any form of data given to it. It simply acts as a platform for people to enter their images and get them compressed.
: The product is built from already existing open source code with slight tweaks by us. It was primarily built for compressing images in our own product i.e. BlockSurvey and at a certain point we had this idea of sharing the benefits accruing from this project with the rest of the world.
: The tool uses a npm module called browser-image-compression
: The tool reads the data from the HTML file reader API and uses the browser-image-compression module to process it. The browser-image-compression module creates an HTML canvas element and draws the image on it and gets the scaled down data back from the canvas. The returned dataURI is read, decoded from Base64 and displayed to the user.
: The compression itself is the same category of work either way: lossy re-encoding to shrink file size. The difference is where that work happens. Most free and paid compressors, including TinyPNG-style tools, upload your image to their server, compress it there, and send back the result. That is fine for a random image you found online, but it is not something you want to do with an ID scan, a medical image, or an internal screenshot. This tool runs the same kind of compression (the browser-image-compression library, drawing on an HTML canvas) entirely in your browser, so the file never leaves your device. There is also no account, no per-image limit, and no monthly cap.
: In most cases, yes, though that is a side effect of how the tool works rather than a dedicated feature. Because compression happens by drawing the image onto an HTML canvas and reading the pixel data back (see how it works above), metadata blocks such as camera model, GPS coordinates, and timestamps embedded in the original file typically do not carry over to the compressed output. If you need a guarantee that a specific photo has no location data attached before you share it, check the downloaded file with an EXIF viewer rather than relying on this as a dedicated stripping tool.

Know how the privacy-focused image compression works

Step 1 : Upload image files

Step 2 : Process files using browser image compression

Step 3 : Download Compressed Images

Private by design: nothing leaves your browser

100% client-side

Nothing stored or logged

Works offline

Built for developers and security-conscious teams

Sensitive uploads

Developers

Everyday sharing

Building something that handles sensitive data?

More free privacy tools

Frequently Asked Questions