Custom document builder
Have your own agreement, letter or form? Paste the text, mark the blanks with {{Seller name}}, and get a fillable form with live preview, signatures, PDF and Word export — the same toolkit as every SealForms template. Free, no signup; nothing leaves your browser.
1. Write or paste your template
Syntax cheat-sheet
{{Seller name}}— a fillable field. Names containing “date” become date pickers.{{Price|1,500}}— field with an example value (used by “Prefill example”).{{signature:Seller}}on its own line — a signature line. It picks up the “Seller name” field automatically; use{{signature:Seller|Some field}}to link another field.# Title— centered document title.## Heading— bold heading.**bold**— bold text.- item— bullet list. Blank line — new paragraph.- The same field name used twice shows the same value in both places.
Templates you save live only in this browser (export a JSON backup to move them). The document you fill in below auto-saves like any other SealForms generator, and the template travels inside share links and “My documents”, so the other party sees exactly the same form.
2. Fill in, sign, download
When to use a custom document
SealForms templates cover the common cases — bills of sale, leases, notices, notes. But plenty of everyday paperwork is one-of-a-kind: a letter your accountant drafted, a short agreement between friends, a form your club or HOA already uses. The builder turns any of those into a fillable, signable form in a minute, without retyping it for every use.
Everything runs in your browser. The text you paste is not uploaded, stored on our servers, or used to train anything. If you share a document with the other party, it travels inside the link itself.
A note of caution. The builder formats your text; it does not review it. Whether a document is enforceable depends on its content, how it is signed, and the law where you are — for anything with significant consequences, have a professional look it over.
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