Amazon Prime Video Subtitle Requirements 2026 — The Complete Delivery Guide

The complete guide to Amazon Prime Video subtitle and caption requirements — accepted file formats, SDH requirements, forced narratives, territory-specific rules, and how to avoid delivery rejection.

If you are preparing a film, series, or documentary for delivery to Amazon Prime Video, the subtitle and caption requirements are among the most detailed — and most frequently misunderstood — technical specifications in the delivery package. A rejected timed text file triggers a formal delivery failure that can delay your release by weeks. This guide explains exactly what Amazon Prime Video requires for subtitles, closed captions, and SDH in 2026, drawn directly from Amazon’s Video Central delivery documentation and their January 2026 supply chain update. Whether you are delivering through Amazon Prime Video Direct as an independent filmmaker or through a distributor or aggregator as part of a multi-territory licensing deal, the timed text requirements covered here apply to your delivery. Read this before you submit.

See also our complete guide to film festival subtitle requirements for format requirements across Sundance, Cannes, Tribeca, and more.

Understanding Amazon’s Timed Text Terminology

Amazon Prime Video uses specific terminology for its timed text assets. Understanding the distinction between these three types is essential — delivering the wrong type causes delivery rejection even if the technical specs are otherwise correct.

Captions / SDH

Captions and SDH (Subtitles for the Deaf and Hard of Hearing) include both spoken dialogue and atmospheric descriptions — sound effects, music cues, speaker identification, and other audio information that a deaf or hard-of-hearing viewer needs to fully understand the content. Amazon explicitly prefers to receive captions or SDH over standard subtitles whenever both are available, because SDH provides a more complete viewing experience for audiences with hearing impairments. For US delivery, English captions are required for all titles — not optional.

Subtitles

Subtitles are timed text assets that contain on-screen dialogue only — without atmospherics. They are primarily used to translate dialogue into another language for international audiences. Subtitles can be delivered either burned into the mezzanine video file or as a separate timed text file. When both captions and subtitles are available for a title, Amazon requires both to be delivered separately.

Forced Narratives

Forced Narratives — also called Forced Subtitles — translate spoken dialogue or on-screen text that is in a different language from the primary audio of the content, when the creative intent requires that dialogue to be understood by the viewer. A common example is a foreign-language conversation in an otherwise English-language film. Forced Narratives are displayed to customers automatically based on their audio choice, not as an optional subtitle selection. Amazon requires a separate Forced Narrative timed text file for every dubbed audio language being provided in a multi-track audio package.

Accepted Subtitle and Caption File Formats

Amazon Prime Video accepts different file formats for captions and subtitles. The list is not interchangeable — some formats are accepted for captions only, some for subtitles only, and some for both.

Accepted Closed Caption / SDH Formats

Format	Extension	Notes
SRT — SubRip Text	.srt	Most common format submitted to Prime Video Direct. Must be UTF-8 encoded. Timecode must start at 00:00:00 — no offset.
SCC — Scenarist Closed Caption	.scc	Preferred for US broadcast delivery. Pop-on captions preferred over roll-up. Amazon automatically converts roll-up to pop-on.
DFXP / TTML	.dfxp	Timed Text Markup Language. Full DFXP only — partial TTML not accepted. UTF-8 encoded.
iTT — iTunes Timed Text	.iTT	Subset of TTML version 1.0. Supports positioning for subtitle placement.
STL — EBU Standard	.stl	EBU STL standard only. Spruce Subtitle .stl format is not supported — do not confuse the two.
Lambda Cap	.cap	The only format that supports discrete Japanese timed text delivery. Required for all Japanese timed text — no exceptions.

Accepted Subtitle-Only Formats

For subtitle files (dialogue-only, no atmospherics), Amazon Prime Video accepts DFXP Full/TTML (.dfxp), iTT (.iTT), and SRT (.srt). Note that the SCC format is for captions only and is not accepted as a standalone subtitle file.

Critical Technical Requirements

These are the technical specifications that cause the most delivery rejections. Every point below must be confirmed before submitting your timed text files.

UTF-8 Encoding — Non-Negotiable

Every timed text file submitted to Amazon Prime Video must be UTF-8 character encoded. Amazon does not accept any other encoding. If you are working with a third-party subtitle provider or creating files in editing software, confirm the output encoding before delivery. A file that is not UTF-8 encoded will fail ingestion.

Zero-Hour Timecode Start — No Offsets

All timed text files must start at 00:00:00:00. Amazon Prime Video does not support timecode offsets. A file with a one-hour offset — common in broadcast workflows where the programme timecode starts at 01:00:00:00 — will not display text until one hour into the video. This is one of the most common submission errors and causes a silent failure that is difficult to diagnose after upload.

File Duration Must Match Video Duration

All timed text assets must be conformed to match the exact duration of the accompanying video file. A subtitle file that is shorter or longer than the mezzanine will be rejected.

Frame Rate Handling

Amazon accepts a wide range of timed text formats with different frame rate handling requirements. For clock-time formats (hh:mm:ss.sss), frame rate information is not required. For frame-based formats (hh:mm:ss:ff or hh:mm:ss;ff), frame rate and drop/non-drop frame information must be included in the MMC asset manifest. For 29.97 and 59.94 frame rates, drop/non-drop information must be specified in the manifest or file naming convention. If left blank, Amazon assumes 29.97.

Sequential Timecodes

All time-codes in a caption file must appear in linear, sequential order. Out-of-order timecodes cause ingestion failure.

Pop-On Captions Preferred

Amazon prefers pop-on captions over roll-up captions. Pop-on captions are more time-synchronized, accurate, and descriptive — appearing one to three lines at a time. Amazon does accept roll-up caption files but will automatically convert them to pop-on format during processing.

Territory-Specific Requirements

Amazon Prime Video has territory-specific subtitle and caption requirements that differ significantly from market to market. Delivering the wrong format or missing a territory requirement causes a delivery rejection in that market.

Territory	Requirement
United States	English closed captions required for all titles — mandatory, not optional. FCC standards apply: completeness, accuracy, synchronicity, and placement (one to three lines at a time).
Japan	All Japanese timed text must be delivered as Lambda Cap (.cap) — the only supported format. Closed captions are not toggle-able for Japanese customers. If delivering without Japanese audio, burned-in Japanese subtitles are required.
United Kingdom	Audio or captions must be in the localized language. English audio with Danish captions is acceptable for UK delivery because the primary audio track is in English.
International	Requirements vary by territory. Amazon’s Supported Features table in Video Central specifies the full list of required timed text assets by territory for multi-territory deliveries.

Forced Narratives — What You Need to Know

Forced Narratives are the timed text requirement that catches the most productions off guard, particularly in post-production when the delivery package is being assembled under deadline pressure.

If your content contains any dialogue, on-screen text, or graphics that are in a language other than the primary audio language and that the audience needs to understand — a foreign-language conversation, a sign in another language, an on-screen chyron in a non-English language — you are required to deliver Forced Narrative timed text files.

For multi-track audio (MTA) packages — content delivered with dubbed audio tracks in multiple languages — a separate Forced Narrative file is required for every dubbed audio language being provided. If you are delivering a semi-textless master where texted elements from the original theatrical version have been removed, you may also need to provide a Forced Narrative file in the original language of the title. The Forced Narrative language-LOCALE designation in your file must match the main video mezzanine exactly. If it does not match, the Forced Narrative will not play to customers when subtitles are set to the off position — a silent failure that is nearly impossible to detect without a full QC review of the delivered package.

What Amazon Updated in January 2026

Amazon’s January 2026 supply chain update included several changes relevant to subtitle and timed text delivery:

• A new Audio Description Style Guide was published with updated style guidance and requirements for sending Audio Descriptions to Prime Video. Productions with AD tracks should review the updated guide before delivery.
• Starting January 22, 2026, subtitles provided by Prime Video are now displayed within the Assets Tab under Catalog, giving content providers greater visibility into localization assets across their catalogue.
• Aspera file transfer migration: Prime Video is migrating from Aspera Shares to Aspera on Cloud by June 2026. Partners using IBM Aspera as their delivery method will receive new login credentials. The alternative is bulk delivery via Amazon S3.
• Brazil new 6+ age rating: A new 6+ age rating was introduced in Brazil. The system implementation is planned for May 21, 2026. No action required until that date.

Prime Video Direct vs. Studio / Distributor Delivery

There are two distinct delivery paths to Amazon Prime Video, and the subtitle requirements — while broadly similar — have important differences between them.

Prime Video Direct

Prime Video Direct (PVD) is the self-service upload platform for independent filmmakers and content creators distributing directly to Amazon. PVD accepts SRT as the most common caption format and DFXP/TTML and iTT for subtitle files. Every submission goes through a series of automated and manual reviews — the process can take up to a month. PVD does not provide specific rejection error messages for caption files — a rejection simply states that captions are required, without specifying the technical cause of the failure. This makes it essential to get the technical specifications right before submission rather than relying on error messages to diagnose problems.

Studio and Distributor Delivery (Video Central / Slate)

Content delivered through distributors, aggregators, or through Amazon Studios’ Slate platform is subject to the full Video Central technical delivery specifications — a significantly more detailed set of requirements covering MMC asset manifests, multi-track audio packages, Forced Narrative handling, frame rate specification, and territory-specific timed text asset requirements. Productions delivering at this level should be working with an experienced post-production house or specialized subtitling provider familiar with the full Video Central specification.

The Most Common Amazon Subtitle Delivery Errors

Based on the delivery specification and common patterns in subtitle delivery across streaming platforms, these are the issues most likely to cause rejection or silent failure on Amazon Prime Video:

• Non-UTF-8 encoding — the single most common cause of timed text ingestion failure
• Timecode offset — files starting at 01:00:00:00 instead of 00:00:00:00
• File duration mismatch — subtitle file not conformed to the exact length of the video
• Wrong STL format — submitting Spruce Subtitle .stl instead of EBU standard .stl
• Missing Forced Narratives — not delivering a separate Forced Narrative file for each dubbed audio language in an MTA package
• Incorrect Lambda Cap for Japanese — submitting Japanese timed text in any format other than Lambda Cap (.cap)
• Missing English captions for US delivery — submitting subtitles only without an English closed caption file
• Out-of-sequence timecodes — non-linear timecode order in caption files
• Missing frame rate in manifest for frame-based formats — required for 29.97 and 59.94 frame rates

How Amazon’s Requirements Compare to Netflix

If you are delivering the same title to both Netflix and Amazon Prime Video, it is worth understanding where their subtitle requirements diverge — because a file that meets Netflix’s specs will not necessarily meet Amazon’s, and vice versa.

Requirement	Amazon Prime Video	Netflix
Preferred format	SRT (Prime Video Direct), SCC, DFXP/TTML, iTT, STL, Lambda Cap	TTML / iTT preferred for originals
Timecode start	00:00:00:00 — no offsets permitted	00:00:00:00 — no offsets permitted
Encoding	UTF-8 only	UTF-8 only
SDH preference	Prefers SDH/captions over subtitles when both available	Requires SDH for all original content
Japanese delivery	Lambda Cap (.cap) required — only accepted format	iTT required
Timing flexibility	More flexible on timing and line length than Netflix	Strict reading speed and line length rules
Styling	Positioning supported for Lambda Cap and iTT only	Full styling spec with character count and positioning rules
Forced Narratives	Separate file required per dubbed language in MTA package	Separate file required per dubbed language
US captions	English captions mandatory for all US titles — FCC standards	English captions required for US originals

The key practical difference: Amazon allows significantly more flexibility in subtitle timing and formatting than Netflix, but has stricter territory-specific requirements — particularly for Japan and the US — and more complex Forced Narrative rules for multi-track audio packages. Productions delivering to both platforms should produce separate, platform-specific timed text files rather than attempting to use a single file for both. Gotham Lab provides subtitle delivery for both Amazon Prime Video and Netflix. View our subtitling services for more information.

Frequently Asked Questions — Amazon Prime Video Subtitles

What subtitle file format does Amazon Prime Video require?

Amazon Prime Video accepts SRT, SCC, DFXP/TTML, iTT, STL (EBU standard only), and Lambda Cap (.cap). For Prime Video Direct, SRT is the most common format. For Japanese content, Lambda Cap is the only accepted format. All files must be UTF-8 encoded and start at timecode 00:00:00:00.

Does Amazon Prime Video require SDH subtitles?

Amazon strongly prefers SDH (captions including atmospherics) over standard subtitles whenever both are available. For US delivery, English closed captions are mandatory for all titles — SDH or captions are required, not optional. SDH provides a more complete viewing experience for audiences who are deaf or hard of hearing and Amazon requires it for all US content.

What are Forced Narratives and when are they required?

Forced Narratives translate dialogue or on-screen text that is in a different language from the primary audio. They are required whenever your content contains foreign-language dialogue or text that the audience needs to understand. For multi-track audio packages with dubbed audio in multiple languages, a separate Forced Narrative file is required for every dubbed language being provided.

Can I use the same subtitle file for both Amazon and Netflix?

Not recommended. While both platforms require UTF-8 encoding and 00:00:00:00 timecode start, they differ on preferred formats, styling requirements, Japanese delivery format, and timing flexibility. Netflix has stricter reading speed and line length rules than Amazon. Productions delivering to both platforms should produce separate platform-specific timed text files.

What happens if my subtitle file is rejected by Amazon?

Prime Video Direct does not provide specific technical error messages for timed text rejections — the error simply states that captions are required. For distributor and studio deliveries through Video Central and Slate, rejection triggers a formal delivery failure notice. The most common causes of rejection are non-UTF-8 encoding, timecode offset, file duration mismatch, and missing English captions for US delivery. Working with a professional subtitling company familiar with Amazon’s specifications before submission is the most reliable way to avoid rejection.

How do I deliver subtitles for an international Amazon Prime Video release?

International delivery requirements vary by territory. Amazon’s Video Central Supported Features table specifies the required timed text assets by territory. At minimum, you will need English closed captions for the US market, territory-specific subtitles for each language market where the content is being released, and Forced Narrative files for any dubbed audio languages included in your multi-track audio package. For complex multi-territory deliveries, working with an experienced post-production partner is strongly recommended.

Need Subtitles for Amazon Prime Video Delivery?

Gotham Lab’s in-house New York City subtitling team produces Amazon Prime Video-compliant subtitle files, SDH captions, and Forced Narrative timed text assets for feature films, documentaries, television series, and streaming content. We deliver in all accepted formats — SRT, SCC, DFXP/TTML, iTT, STL, and Lambda Cap — with UTF-8 encoding, zero-hour timecode conformance, and file duration matching as standard on every project. For productions requiring both subtitles and a Combined Continuity and Spotting List, Gotham Lab handles both in-house.

Contact Gotham Lab: info@gothamlab.com  |  +1 347-587-8110  |  340 W 42nd St #2424, New York, NY 10108

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