When using the URL field type the user is limited to paste urls up to 255 characters.

This is much lower than the max url length of all modern browsers:

Additionally, several other third-party business tools such as Microsoft SharePoint can generate URLs that are longer than the 255 character limit.

Other Third Party Tools that can potentially generate URLs longer than 255 characters that customers might include in Jira custom fields:

• Marketing Automation and Email Platforms
  • HubSpot, Marketo, Pardot, Mailchimp, etc. often append large tracking parameters and unique IDs to links to measure campaign performance.
  • Links in automated or personalized emails may include multiple query parameters for subscriber identification, source tracking, or triggered workflows.
• CRM Systems (e.g., Salesforce)
  • Deep links to specific records, reports, or custom views can include long query strings.
  • When sharing filtered reports or dashboards, URLs often include extensive filter data, object IDs, or session tokens.
• Analytics and Reporting Tools
  • Google Analytics, Google Data Studio, Adobe Analytics, or Power BI share links with multiple parameters (campaign tags, filters, date ranges, etc.).
  • Custom or embedded dashboards frequently use encoded parameters to reflect user-specific views, filters, or data sets.

Workaround:

You can use one of the many Third Party URL shortening tools to create shorter links below 255 characters that can be pasted into Jira links.

Some of these URL Shortener tools also have integrations into tools like SharePoint such as ShortUrl (Short Url, Tiny Links)