Image Resize
An open-source resizer purpose-built for one job: preparing images to the exact 512px specs Telegram sticker packs require, with the code published on GitHub.
Key features
- Resizes images to the 512px specs required for Telegram sticker packs
- Open-source, with published source code on GitHub
- Simple send-a-photo, get-a-resized-image flow
Image Resize
Image Resize (@ImageResizeBot) has an unusually narrow and well-documented purpose: its bio states it is meant to "resize images for Telegram sticker packs" and links to its source code on GitHub. That solves a very specific pain point — Telegram's official Stickers bot rejects images that are not exactly 512px on the long side, and most photos are not.
Rather than trying to be a general-purpose compressor, it does one narrow, well-defined conversion, which tends to produce more predictable results than an all-purpose tool. Send a photo, get back an image resized to the dimensions Telegram sticker packs expect, ready to hand off to the official Stickers bot for the actual pack creation.
The published GitHub repository is a genuine trust signal in this category — you (or anyone technical) can inspect exactly what the code does rather than trusting an opaque bot with your images.
How to start
- Open @ImageResizeBot and tap Start
- Send the photo you want resized for a sticker pack
- Receive the resized image, ready for the official Stickers bot
Commands
/startShow the welcome messagePricing and limits
Free
Pros / Cons
- Open-source with a public, checkable codebase
- Solves the exact 512px sticker-prep problem precisely
- Free to use
- Narrow scope — not a general-purpose photo compressor
- No visible monthly-user count
- No published file-size limit
Score breakdown
| Criterion | Weight | Points | |
|---|---|---|---|
| Functionality | 25 | 6 / 10 | |
| Reliability & speed | 15 | 6 / 10 | |
| Popularity & trust | 15 | 4 / 10 | |
| Price & free tier | 10 | 9 / 10 | |
| Usability | 10 | 7 / 10 | |
| Safety & privacy | 10 | 7 / 10 | |
| Freshness | 5 | 5 / 10 | |
| Localization | 5 | 5 / 10 | |
| No intrusive ads | 5 | 6 / 10 | |
| Score | 100 | 61.0 |
Alternatives
All alternatives →
CompressA plainly named general-purpose compression bot — no detailed bio, but a clear single job implied by the name.ShrinkImage BotA compression bot with a concrete, published promise: shrink JPG, PNG and WEBP files by up to 90%, free, no…PDF Bot • Free ConverterAn all-in-one PDF toolbox: its own bio lists image-to-PDF and PDF-to-image conversion as core services,…Image CompressOne more directly named compression bot — functionally similar to its close relatives, worth having as a…FAQ
Does it also create the sticker pack itself?
No, it only resizes the image; use Telegram's official @Stickers bot to actually publish the pack.
Can I check how it processes my image?
Yes, its source code is published on GitHub and linked from its bio.
Technical details
- Inline mode
- Mini App
- Works in groups
- Works in channels
- Accepts voice
- Accepts files
- Requires phone number
- Requires registration
- Shows ads
- Works in Russia without VPN