--- title: Flatten PDF Online Free – Lock Form Fields, Comments & Annotations | HelpRange url: https://www.helprange.com/tools/flatten-pdf --- Free tool # Flatten a PDF Turn filled-in form fields, comments, highlights and stamps into ordinary page content – the last step before you send a final version. ## How it works ### Choose your PDF A filled-in form, a commented draft or a signed document – up to 10 MB. ### Choose what happens to comments Flatten them into the page, or delete them and flatten only the form fields. ### Download the flattened PDF Fields, checkboxes, stamps and annotations are now part of the page and can no longer be edited. ![A filled-in PDF form after flattening: the values are part of the page](/static/images/ui/tools/flatten-pdf.jpg)A filled-in PDF form after flattening: the values are part of the page ### Final version? Send it so it cannot be passed around A flattened PDF can still be forwarded and printed. HelpRange shares it as a link with the reader's e-mail on every page, downloads blocked and access you can revoke – and shows who opened it. [Try HelpRange free](https://www.helprange.com/#signUpSection) [See secure sharing](https://www.helprange.com/feature-secure-documents-sharing) Flatten a PDF when a form is final – a signed application, a completed tax form, a contract with filled-in fields – so the values cannot be changed and look the same in every viewer, including those that do not show form fields. ## What “flatten” means A PDF can have layers on top of the page: form fields you can type into, checkboxes, comments, highlights, stamps and signature widgets. They are stored separately from the page content, so they can be changed, removed, or simply not shown by some viewers and printers. Flattening draws them into the page itself. The document looks the same, but the values are fixed – there is nothing left to fill in or edit with form tools. Flatten when a form is final: a completed application or tax form, a contract with typed names and dates, an invoice from a fillable template, or a reviewed draft whose highlights should stay visible for everyone. ## Good to know - Flattening is one-way – keep the fillable original if you will need it again. - Comments that should not travel with the file? Choose “delete comments” instead of flattening them into the page. - Flattening does not hide information under the page: to remove text use [redaction](https://www.helprange.com/tools/redact-pdf), and to remove author and history use [metadata removal](https://www.helprange.com/tools/remove-pdf-metadata). - It also removes form actions such as “submit to server” buttons. Want to keep people from editing at all? Add a password with [PDF protection](https://www.helprange.com/tools/password-protect-pdf), or share a view-only link. FAQ ## Flatten a PDF – questions What does flattening a PDF do? It merges interactive layers into the page itself: form fields become plain text, checkboxes become drawings, comments and stamps become part of the page. The PDF looks the same but can no longer be filled in or edited with form tools. Is a flattened PDF secure? It is harder to change by accident, but anyone with a PDF editor can still edit the page content. To control who can read the file and stop downloads, share it as a protected link instead. Do you keep my file? No – it is processed in memory and not stored. How do I flatten a PDF without Adobe Acrobat? Upload it here and download the flattened copy – free, no sign-up. In Acrobat you would use Print to PDF or the Preflight “Flatten annotations and form fields” fix. Will a flattened PDF look different? No – fields and annotations look as they did in the viewer; they simply become part of the page. Related free tools [Redact a PDF – permanently](https://www.helprange.com/tools/redact-pdf)[Password-protect a PDF](https://www.helprange.com/tools/password-protect-pdf)[Is this PDF safe to send?](https://www.helprange.com/tools/pdf-security-check)[See and remove hidden PDF metadata](https://www.helprange.com/tools/remove-pdf-metadata) [All free tools](https://www.helprange.com/tools)