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Dataset Card for Online Handwriting Strokes

Online Handwriting Strokes

Words handwritten on a phone screen with a finger or stylus, captured as time-stamped stroke coordinates, not images.

Collected through the Kled app by consenting contributors and licensed for commercial training. The files are delivered by Kled under license, not downloaded from this repository. Use Request a sample set at the top of this page, or write to team@kled.ai. Catalog entry: kled.ai/datasets/write-this-with-your-finger.

Dataset Details

Dataset Description

A photograph of handwriting has lost what recognizers want most, stroke order and timing; here the app records writing as it happens. Contributors see a word from a 50,000-item prompt bank and write it on the touchscreen at normal speed; path, coordinates and timing are captured, mapped to the prompted word. Scribbles and slow tracing are sent back; words come in batches of 20 per session from contributors worldwide, so breadth of hands wins over depth on a few writers. Data is delivered as JSON stroke sequences, easy to convert to InkML. IAM-OnDB is non-commercial and twenty years old; this is online handwriting you can train on commercially.

Curated by: Kled (useKled)
Collected through: Touchscreen (finger or stylus)
Language(s): English, Indonesian, Malay, Filipino, Spanish, French, Hindi
Regions: Global, 100+ countries
Volume: 250,000+ words (approx. 5 GB)
Contributors: 6,200+
Modality: Interaction
Format: Stroke data (JSON)
Resolution: JSON stroke sequences with point coordinates and timestamps
Annotations: Raw (no labels)
Quality control: 99%+ passed QA review
License: Non-exclusive commercial training license (terms); exclusivity available on request
Consent: Each contributor opted in to this use when they uploaded.

Dataset Sources

Catalog page: kled.ai/datasets/write-this-with-your-finger
Sample set: through the access request at the top of this page, or team@kled.ai
Publisher: huggingface.co/useKled

Uses

Direct Use

Online handwriting recognition
Stroke-sequence modeling and handwriting synthesis
Touch-input research

Out-of-Scope Use

Redistribution or resale of the files, use outside the terms of the commercial training license, and any attempt to identify or contact contributors or people who appear in the data. Uses that require labels this set does not carry should be scoped with the data team first.

Dataset Structure

Data Instances

One word per record, delivered as Stroke data (JSON). Volume: 250,000+ words.

Data Fields

File: the Stroke data (JSON) file as captured or uploaded by the contributor
Labels: none; the set is delivered raw. Labeling on the same items is available on request.
Capture metadata: capture tool, country of capture, submission time
Review status: QA outcome (99%+ passed QA review)

Field names and the manifest format are confirmed with the sample set.

Data Splits

Delivered as one set. Subsets by country, language or label, and custom splits, are available on request.

Dataset Creation

Curation Rationale

The dataset exists because the public alternatives named in the description are non-commercial, synthetic, small or collected elsewhere. Kled runs the task as a paid brief in its app so that the data is captured on purpose, under the capture rules above, by people who have opted in to commercial use.

Source Data

Data Collection and Processing

Contributors complete the task in the Kled app. Capture tool: Touchscreen (finger or stylus). Each submission is reviewed against the task brief; submissions that break the capture rules are rejected. 99%+ passed QA review. Files are delivered as Stroke data (JSON), in the resolution noted above.

Who are the source data producers?

Kled contributors, who complete paid data tasks on their own phones. This task was open to contributors worldwide. Kled has 625,000+ contributors in 100+ countries, strongest in Southeast Asia, the United States and Europe.

Annotations

Annotation process

No annotations are included. Items are delivered as captured; labeling on the same items can be scoped with the data team.

Who are the annotators?

Not applicable; no annotations are included.

Personal and Sensitive Information

Every item was contributed by its owner, who opted in to this use at upload. The task brief states what may and may not appear in a submission, and reviewers reject submissions that break those rules. Kled's data handling practices are documented at trust.kled.ai; questions about handling requirements for your use go to team@kled.ai.

Bias, Risks, and Limitations

Coverage follows the contributor base: strongest in Southeast Asia, the United States and Europe, thinner elsewhere, and not limited by region for this task. Devices, settings and conditions vary by contributor, which is the point of the collection and also means no two items are captured under identical conditions. Where labels are contributor-entered, they are checked at review but are not expert annotations. Volumes are the current scope of the task and grow as collection continues.

Recommendations

Request a sample set and run it against your task before licensing. Ask for per-country or per-language counts where they matter to your use.

Licensing Information

Non-exclusive commercial training license; exclusivity on request. Each contributor opted in to this use when they uploaded. The license terms are on the catalog page.

Citation

@misc{kled_write_this_with_your_finger_2026,
  title        = {Online Handwriting Strokes},
  author       = {Kled},
  year         = {2026},
  url          = {https://www.kled.ai/datasets/write-this-with-your-finger},
  note         = {Commercially licensed dataset collected through the Kled app. Sample sets on request.}
}

Dataset Card Contact

Kled data team: team@kled.ai

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