TinyPNG MCP server

Compress, resize and convert images with TinyPNG by URL, and check this month's compression count. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect TinyPNGFree 50 calls/mo

What can I ask?

Turn on the TinyPNG connector, then ask in plain words. The AI picks the tools.

How many compressions have I used this month, and is my key valid?
Compress this product photo: https://example.com/images/shoe.jpg
Shrink the image at https://example.com/banner.png to 800 pixels wide.
Convert https://example.com/logo.png to WebP and tell me how much smaller it is.

What you can do with TinyPNG in Claude and ChatGPT

For web developers and shop owners who shrink and convert images with TinyPNG.

Compress an image from a URL

The AI compresses a public image by URL and reports the compressed size, type and saving. It can also return the compressed image itself, up to 1 MB.

Changes data

Resize an image to a given width

The AI compresses an image from a URL, then resizes it, for example to 800 pixels wide. The resized image comes back only when it is under 1 MB; otherwise you get its size and type.

Changes data

Convert an image to WebP or another format

The AI compresses an image from a URL, then converts it to a format such as WebP, and reports the resulting type and size.

Changes data

Check how many compressions you used this month

The AI reads the compression count of your key for the calendar month and tells you if the key is valid. It compresses nothing.

How do I connect TinyPNG?

Before you connect

The login page asks for your TinyPNG API key.

Get a free key (500 compressions a month) at tinify.com/developers, then copy it from your API dashboard. Every compression, resize and conversion counts against your own Tinify quota. Your key is used only to call the Tinify API on your behalf; it is never shown to anyone.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name TinyPNG and this URL, then click Add:
https://tinypng.usefulapi.io/mcp
Claude opens the login page: enter your TinyPNG API key.
In a chat, click + → Connectors and turn on TinyPNG.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name TinyPNG and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://tinypng.usefulapi.io/mcp
ChatGPT opens the login page: enter your TinyPNG API key.
In Plugins, install TinyPNG, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http tinypng https://tinypng.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "tinypng": {
      "url": "https://tinypng.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "tinypng": {
      "type": "http",
      "url": "https://tinypng.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add tinypng --url https://tinypng.usefulapi.io/mcp

codex mcp login tinypng

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://tinypng.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your TinyPNG API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper API key	$9/mo · $90/yr	10,000 tool calls / month
Pro+per API key	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this TinyPNG server only. Ask your AI to run tinypng_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with tinypng_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with tinypng_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 8

Show all 8 tools (the AI picks them for you)

Read only · 2

Download a compressed imagetinypng_download_image
Fetch the compressed image of an earlier tinypng_compress_image (its output_url, valid about 48 hours) and return it as an image with its type, byte size, width and height. Images over 1 MB are described but not returned inline. Downloading does not use extra compression quota.
Get compression usage this monthtinypng_get_usage
How many compressions your Tinify API key has used this calendar month (the Compression-Count header), and whether the key is valid. The check sends an empty request that Tinify refuses, so nothing is compressed and no quota is used. Compare with your Tinify plan (the free plan includes 500 per month). POST /shrink with no body.

Changes data · 2

Compress an image from a URLtinypng_compress_image
WRITE (uses quota): ask TinyPNG (Tinify) to fetch a public image by URL and compress it (JPEG, PNG, WebP, AVIF or JPEG XL). Returns the output_url (Tinify's Location address of the compressed image), the compressed size and type, the savings when the input size is known, and the Compression-Count header (compressions used this month). The image is stored by Tinify for about 48 hours; output_url needs your API key, so use tinypng_download_image to get the bytes and tinypng_transform_image to resize, convert or keep metadata. Each compression counts against the monthly quota of your Tinify API key (the free plan includes 500 per month); resizing and converting count one extra compression each.
Resize, convert or keep metadata of a compressed imagetinypng_transform_image
WRITE (uses quota): apply a resize, a format conversion and/or metadata preservation to an image compressed earlier (the output_url from tinypng_compress_image, valid about 48 hours). Returns the resulting type, byte size, width, height and Compression-Count; the image itself is returned too when include_image is true and it is under 1 MB. Resize: method scale (give width OR height), or fit / cover / thumb (give width AND height); images are never scaled up. Convert: one or more of image/webp, image/jpeg, image/png, image/avif, image/jxl (several = the smallest is returned) or */* (the smallest of WebP, JPEG, PNG); converting a transparent image to JPEG needs a background colour. Preserve: copyright, creation, location (location is JPEG only) keeps that metadata, which makes the file slightly larger. Each call is a fresh request: resize and convert each count one extra compression on your monthly Tinify quota, preserve is free. Tinify returns the bytes only (no new URL), so only include_image gives you the transformed file, and only when it is under 1 MB.

Your usefulapi plan · 4

Usage status (free-tier meter)tinypng_usage_status
Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
Request a missing featuretinypng_request_feature
Tell usefulapi that the user needs something the TinyPNG tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
Upgrade to Pro or Pro+tinypng_upgrade
Get a paid plan for TinyPNG (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
Cancel the Pro subscriptiontinypng_cancel_subscription
Cancel the caller's TinyPNG Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run tinypng_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with TinyPNG in Claude or ChatGPT?

Compress an image from a URL. Resize an image to a given width. Convert an image to WebP or another format. Check how many compressions you used this month. See what you can do for the details.

Is this an official TinyPNG product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by TinyPNG. The server calls the TinyPNG API with your own TinyPNG access, so it sees only the data that your account can see.

Can I connect TinyPNG to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your TinyPNG API key. See Before you connect for where to find it.

Do I put my TinyPNG key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your TinyPNG API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my TinyPNG credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the TinyPNG API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in TinyPNG.

Can the AI change my TinyPNG data?

Yes, if you approve it. 2 of the 4 TinyPNG tools can create or change data. The other 2 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this TinyPNG server only. Cancel any time: your paid plan then runs to the end of the paid period. Run tinypng_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run tinypng_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run tinypng_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a TinyPNG tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with tinypng_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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