Character Limits Across the Web: A Verified Reference

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The full dataset is available as a machine readable JSON file. Records use a fixed schema with platform, field, character_limit, pixel_limit, is_hard_limit, notes, source_url, source_name and last_verified.

File: character-limits-2026-v1.json · CC-BY-4.0 license terms

How to cite

Gizmoop Editorial Team (2026). Character Limits Across the Web: A Verified Reference (2026 Edition, v1.0). https://gizmoop.com/research/character-limits

Categories in this dataset

• Search engines (10 records)
• Social media, X (8 records)
• Social media, Facebook (5 records)
• Social media, Instagram (7 records)
• Social media, LinkedIn (8 records)
• Social media, others (8 records)
• Messaging (7 records)
• Email and SMS (6 records)
• SEO platforms (8 records)
• Open Graph and Twitter Cards (6 records)
• App stores (7 records)
• Tech and browser (4 records)
• Developer and APIs (5 records)

Methodology

How limits were verified

Each row was checked against primary platform documentation (help centers, developer docs, RFCs) where available. When official documentation was missing or ambiguous, we verified the limit by direct testing in the platform composer or by checking against the platform's public SDK or web client source. Where a value still could not be confirmed, the row is labeled with source_name "Industry consensus" and source_url is null. We did not extrapolate or invent values.

Inclusion criteria

We included fields from platforms with at least roughly 10 million monthly active users (social, messaging, app stores) and standards bodies (IETF, 3GPP, W3C). Fields are included when length materially affects publishing, display, search ranking, deliverability, or protocol behavior. Both hard limits (enforced by the platform) and display limits (where text is truncated rather than rejected) are included and are distinguished by the is_hard_limit boolean.

Update cadence

The dataset is reviewed quarterly at minimum. When a platform changes a limit between releases, we document the change in the changelog and update the relevant record's last_verified field.

Versioning policy

We use semantic versioning. v1.x releases add new categories or records and update existing values. v2.x releases would change the record schema in a breaking way. The dataset identifier (character-limits-2026-v1) is stable for the v1 series.

Known unknowns

A small number of limits are not officially documented by their owner platforms (iMessage, Snapchat display widths, Browser tab title rendering). For those rows we marked the source as "Industry consensus" and used the most commonly reported value from at least three independent technical sources. These are candidates for verification in v1.1, with help from the community.

Citation guidelines

You may reuse this dataset in any context, commercial or non commercial, with attribution to Gizmoop. The recommended citation forms are below.

APA

Gizmoop Editorial Team. (2026). Character Limits Across the Web: A Verified Reference (2026 Edition, v1.0) [Dataset]. Gizmoop. https://gizmoop.com/research/character-limits

MLA

Gizmoop Editorial Team. "Character Limits Across the Web: A Verified Reference (2026 Edition, v1.0)." Gizmoop, 3 June 2026, gizmoop.com/research/character-limits.

BibTeX

@misc{gizmoop_charlimits_2026,
  title  = {Character Limits Across the Web: A Verified Reference (2026 Edition, v1.0)},
  author = {{Gizmoop Editorial Team}},
  year   = {2026},
  url    = {https://gizmoop.com/research/character-limits},
  note   = {Dataset, CC-BY-4.0}
}

If you use this dataset in a research paper, blog post, presentation, or product, please email gizmoopofficial@gmail.com so we can link to your work.

Changelog

Related Gizmoop tools

• Meta Description Length Checker , check pixel and character width of any meta description.
• Title Tag Length Checker , test SEO titles against the 600 pixel display budget.
• Character Counter , instant character, word, and line counts for any text.
• Twitter Character Counter , counts with t.co URL accounting for X posts.