
Buffer
Hootsuite
Ayrshare
Later
Publer
Postiz
Metricool
Social Media API for developers. Post to TikTok, Instagram, YouTube, Facebook & 19 more platforms with one API call. MCP server for Claude/ChatGPT, white-label for SaaS. 70k+ users.
iLoveIMG
TinyPNG
Squoosh
Caesium Image Compressor
Compressor.io
Image Resizer for Windows
Resizing.app
Free online app to crop and resize images

Which is more popular?
Based on our record, ImageResizer seems to be more popular. It has been mentioned 9 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
|
IR
ImageResizer
|
|
|---|---|---|
| Website | upload-post.com | imageresizer.com |
| Pricing | — | |
| Platforms | — | |
| Company | Startup from Spain · 1 - 9 employees · 2025 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

Upload-Post is a social media API that lets developers post to TikTok, Instagram, YouTube, Facebook, X (Twitter), LinkedIn, Pinterest, Threads and more with a single API call. Built for SaaS platforms, agencies, and developers who need reliable multi-platform publishing without managing...
No description of ImageResizer yet.
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
ImageResizer is recommended for bloggers, small business owners, photographers, and graphic designers who need a convenient and efficient way to process images for websites, social media, or print media without high expenditure on advanced editing software.
Walkthroughs and reviews on video.
No Upload-Post videos yet. You could help us improve this page by suggesting one.
Imageresizerr.com Reviews [ With Proof Scam or Legit ? ] Imageresizer ! Imageresizer Com Reviews
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Upload-Post and ImageResizer.
Upload-Post's answer
Upload-Post is the only API that lets you post to 10+ social platforms with a single endpoint. No need to integrate TikTok, Instagram, YouTube, and Facebook APIs separately — one call handles everything. We also offer true white-label: your users connect their accounts directly, so you never touch their credentials.
Upload-Post's answer
Upload-Post's answer
Upload-Post's answer
We were building a SaaS and needed to post to multiple social platforms. Integrating each API separately was painful — different auth flows, formats, rate limits, and constant breaking changes. So we built Upload-Post to solve it once. Now thousands of developers use it to skip the headache and ship faster.
Share your experience with using Upload-Post and ImageResizer. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking Upload-Post since Feb 2026.
800x450 is 2.4 times smaller then regular HD quality (1920x1080), you can use https://imageresizer.com/ to resize your image. Source: over 3 years ago
The bot's avatar image you're attaching might be too large. If that is the case use a service like https://imageresizer.com to shrink it to a reasonable size. Under 1MB is safe. Source: over 3 years ago
Windows PTs only has a simple resize tool. What you want is https://imageresizer.com/ that is mentioned in the sticky guide that has a crop function as well. I hope this helps :). Source: over 3 years ago
When comparing Upload-Post and ImageResizer, you can also consider the following products.

Buffer makes it super easy to share any page you're reading. Keep your Buffer topped up and we automagically share them for you through the day.
Compare Buffer to Upload-Post or ImageResizer:

iLoveIMG is one of most powerful solution that comes with all the major tool you cloud want to edit images in bulk.
Compare iLoveIMG to Upload-Post or ImageResizer:

Enhance your social media management with Hootsuite, the leading social media dashboard. Manage multiple networks and profiles and measure your campaign results.
Compare Hootsuite to Upload-Post or ImageResizer:

Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Compare TinyPNG to Upload-Post or ImageResizer:

Powerful APIs that enable you to send social media posts effortlessly. Post and manage your users social account via an API.
Compare Ayrshare to Upload-Post or ImageResizer:

Compress and compare images with different codecs, right in your browser
Compare Squoosh to Upload-Post or ImageResizer: