01Why Gmail says your signature is too long
Google documents a 10,000-character limit for Gmail signatures, including image markup. Pasting from Word or an AI tool often duplicates styles and embeds images as base64, which counts against the limit immediately.
Tool · Signature size meter
Gmail limit 10,000
Paste HTML, then check size before you save in Gmail.
03How to fix “signature is too long” in Gmail
Clear the signature box completely
Settings › See all settings › General › Signature
Gmail settings, General › Signature. Checked 2 Nov 2026.
Replace pasted images with hosted images
In Gmail, use Insert image › Web Address (URL) instead of pasting images into the box.
Remove duplicated inline styles
Or rebuild the signature in the generator so tables and styles are not duplicated.
Shorten long tracking URLs
Paste again and click Save Changes
Save at the bottom of the Gmail settings page.
Rebuild it under the limit, free
No sign-up
04Gmail signature size: image dimensions that stay under the limit
Keep logos around 300 pixels wide on screen, uploaded at 2× resolution, and host them on a public https URL. Hosted images stay lighter than pasted or embedded images.
05Why this happens
Copied rich text becomes HTML in the signature box. Base64 image data inflates character count even when the visible signature looks short.
FAQ
What is the Gmail signature character limit?+−
Gmail allows up to 10,000 characters in an email signature, according to Google's Gmail Help. Google also says images count toward that limit.
Do pasted images count?+−
Yes. Google's Gmail Help states that an image counts toward the signature character limit. Images inserted from a public web address are lighter than pasted or embedded images.
Why does Gmail say my signature is too long when it's short?+−
The visible text may be short, but pasted formatting and embedded images add hidden characters. Re-add images by URL and strip duplicate styling to reduce size.
Related