TinyPNG alternative: compress images without uploading
TinyPNG is well known for making PNG and JPEG files much smaller while keeping them looking good. Its approach for PNGs, reducing the number of colours, is a smart technique and often gives excellent results.
People look for a TinyPNG alternative when they want to avoid uploading photos, when they run into the free batch limit, or when they want to resize and convert in the same place. MergeDoc's Image Compress re-encodes your picture as a JPEG at a quality you choose, in your browser.
That is simpler than TinyPNG's method, and the differences matter, so we spell them out below.
Why people look for a TinyPNG alternative
Personal photos and client assets
Product shots before launch, ID photos or family pictures are not things everyone wants to upload to a third party just to shrink them.
Batch limits on the free tier
Cloud compressors typically cap files per batch and file size for free users. Check their current terms for today's numbers.
One place for resize, convert and compress
Image weight depends on dimensions and format as much as quality. See resize image without losing quality and compress images for faster websites.
Web page speed
Oversized photos are among the most common reasons a page loads slowly. Shrinking them before upload to your site is a quick win, and doing it locally means your unpublished images stay private until you decide to release them.
Email and form attachments
Many email providers and web forms reject attachments above a size threshold. Lowering JPEG quality a little is often enough to get a photo under the limit without it looking noticeably worse on a normal screen.
TinyPNG vs MergeDoc, side by side
| TinyPNG | MergeDoc | |
|---|---|---|
| Where your images go | Uploaded to their servers for compression. | Re-encoded in your browser with a canvas. Nothing is sent. |
| Sign-up | Web tool typically works without an account; API and higher limits use one. | None. |
| Usage limits | Free use typically limits the number and size of files per batch. | None from us; one image at a time. |
| Watermark | None on free output. | None. |
| PNG handling | Typically quantizes PNGs to fewer colours and keeps transparency. | Output is always JPEG, so transparency is lost and flat areas become a solid fill. |
| Control | Mostly automatic. | You pick the quality with a slider and can see the resulting size. |
| Batch work | Multiple files at once, plus plugins and an API. | One file per run. |
| Resize and convert | Focused on compression, with separate tools for related jobs. | Companion tools for [resizing](/image-resize) and [format conversion](/image-converter). |
When TinyPNG is still the better pick
- •You compress PNGs with transparency, such as logos or icons. Our tool outputs JPEG, which drops the alpha channel.
- •You need batch compression of many files, a WordPress plugin or an API.
- •You want smart, automatic results with no quality slider to tune.
- •You need the smallest possible PNG, where colour quantization typically beats our approach.
- •You want to keep a transparent PNG as a PNG but still shrink it, which needs colour reduction rather than JPEG re-encoding.
- •You process product catalogues where consistent automated results across hundreds of files matter more than local privacy.
How to switch in a few steps
- 1.
Open Image Compress, choose a JPG or PNG and set the quality slider. Around 70 percent is the default.
- 2.
Compare the output size, download it, and drop the slider lower if you need smaller.
- 3.
If dimensions are the issue, shrink them first in Image Resize. Use Image Converter if you need PNG or WebP output.
Tools covered
Read next
Compress Images for Faster Websites: A Practical Guide
Resize first, then compress, then pick the right format. A practical workflow for smaller JPG, PNG and WebP images, done free in your browser.
How to Resize an Image Without Losing Quality
What actually causes quality loss when you resize, why shrinking is safe and enlarging is not, and how to get a smaller file too.
Why Client-Side Tools Matter: Keep Files on Your Device
Most online file tools upload your data to a server. Here is why many tasks do not need that, and the honest trade-offs of doing it locally.
Other alternatives
Frequently asked questions
- Is there a TinyPNG alternative that does not upload images?
- MergeDoc compresses images in your browser, so photos never leave your device.
- Does it keep PNG transparency?
- No. Image Compress outputs JPEG, which has no transparency. Use [Image Converter](/image-converter) if you need to keep a PNG.
- Will it compress as well as TinyPNG?
- For photos, a JPEG at a sensible quality gets close. For PNG graphics, TinyPNG's colour reduction typically does better.
- What quality setting should I use?
- Start around 70 percent and go lower until you can see artifacts, then step back. More tips in [compress images for faster websites](/blog/compress-images-for-faster-websites).
- Can I compress many images at once?
- Not at present. It handles one image per run.
- Is there a file size limit?
- We do not set one; very large images are limited by your browser memory.
- Does compressing change the image dimensions?
- No. Image Compress keeps the original pixel dimensions and only lowers the JPEG quality. Use Image Resize if you also want fewer pixels.
TinyPNG is a trademark of its owner and is named here only for comparison. MergeDoc is not affiliated with or endorsed by TinyPNG. Check their current terms for the latest details.