Compare AI screenwriting tools by checking whether they preserve the screenplay information your workflow requires through a complete import-and-export round trip. Fountain favors readable plain text and portability, while FDX can carry production-oriented details that may not survive conversion.
Start With the Differences Between FDX and Fountain
The useful question is not simply whether a tool can open and save Final Draft and Fountain files. Ask what information remains intact after the screenplay moves between formats.
Fountain is a plain-text markup convention that identifies elements such as scene headings, character names, dialogue, and parentheticals. It can be written in an ordinary text editor, making readability and portability central strengths. Its official guide says major screenwriting applications can import basic Fountain content, although some special features may be omitted.
FDX serves a different need. One More Draft describes it as an XML-based format capable of carrying details such as dual dialogue, revision marks, scene numbers, and act structure—information that may be thin or absent in Fountain. A suitable tool therefore depends on whether the workflow prioritizes portable text, detailed production data, or dependable movement between both.
Use a File-Handling Comparison Checklist
Evaluate each tool with the same representative material. Check whether it correctly classifies scene headings, character cues, dialogue, parentheticals, and voice indicators. Misclassification in any of these areas can turn a nominally successful import into substantial manual cleanup.
Inspect title-page data, sections or synopses, intentional line breaks, and spacing as well. ScreenWeaver identifies these as areas where Fountain implementations can differ. Do not assume that a file extension or successful save proves fidelity; open the exported file and examine its contents.
Also record whether the tool reliably saves to the required standard format and whether its workflow stays out of the writer’s way. MyWriters.life proposes formatting accuracy, dependable standard-format saving, and an unobtrusive workflow as baseline software criteria. Treat that as the publisher’s evaluation framework, not as an independently validated benchmark. Apply the criteria consistently rather than accepting promotional claims as test results.
Test a Complete Import-and-Export Round Trip
Work from a duplicate, representative screenplay rather than an active master file. Include ordinary scenes plus any features important to your process. Keep the original unchanged as the comparison copy.
- Import the duplicate and inspect its scene headings, character cues, dialogue, parentheticals, and voice indicators.
- Check the title page, sections, synopses, line breaks, and spacing.
- Export to the other format, reopen that export, and compare it with the original.
- If the workflow returns to the starting format, repeat the inspection after that final conversion.
Compare structure and meaning, not merely whether the file opens. When production details matter, specifically inspect dual dialogue, revision marks, scene numbers, and act structure. When exporting to Fountain, read the resulting plain-text file because title-page information can be omitted.
Record page-count changes separately from lost content. ScreenWeaver says Fountain does not encode pagination, so page count depends on the application rendering the screenplay. A changed page count may reflect rendering settings, but it still matters when page-based planning or review is part of the workflow.
Use the same test script and checklist for every candidate. The supplied material offers no controlled AI-tool benchmarks, so this process supports a workflow-specific comparison rather than a universal product ranking.
Conclusion
Favor the tool that preserves the elements your actual workflow needs across a full round trip. Fountain’s readable plain text and portability are distinct from the richer production details attributed to FDX, so compatibility should be judged against the intended destination and use of the script—not by a simple import checkbox.
Before committing an active project, run a duplicate representative screenplay through the complete cycle and compare element classification, title-page data, spacing, pagination, and required production metadata.
Disclosures and limitations
- This article was prepared with AI assistance using only the supplied Fountain, ScreenWeaver, One More Draft, and MyWriters.life source material; vendor- or publisher-authored claims are attributed and are not presented as independent testing.
- No products are recommended or ranked from the available evidence. No affiliate relationship was supplied; readers should verify any commercial or affiliate relationship before acting on a future product recommendation.
Related reading
- Screenwriting Resources and Dramatic Reference
- How Should a Writing Team Control Screenplay Versions During Collaborative Revisions?
Sources
- How to Import and Export Fountain Files Without Losing Your Formatting — ScreenWeaver
- How to – Fountain — fountain.io
- Final Draft (.fdx) vs Fountain: which screenplay file format? – One More Draft — One More Draft
- Screenplay Software Comparison 2026 — Final Draft vs Celtx vs Free | MyWriters.life — MyWriters.life