Do I need an OpenAI account or API key to use OpenAI.fm?

No. OpenAI.fm is a free, publicly accessible demo from OpenAI that lets visitors preview speech generation in the browser. You need your own API credentials and billing only if you want to call the TTS endpoint from an application.

Can the voices speak languages other than English?

Most gpt-4o-mini-tts voices are English-first, though several are described as multilingual and can speak other languages with varying accents. Quality in non-English languages depends on the specific voice you pick.

What audio formats does the underlying model support?

The API supports audio output formats such as MP3, Opus, AAC, and FLAC. The demo itself plays audio in the browser, so for a downloadable file in a specific format you should use the API.

Is OpenAI.fm an official OpenAI support channel?

No. It is an independent demonstration page for OpenAI's speech technology. It is not an official OpenAI support channel and it does not give access to ChatGPT or any other OpenAI product beyond speech synthesis previews.

OpenAI.fm の月間トラフィックと成長トレンドはどうですか？

OpenAI.fm は現在、月間 35.9万の訪問があり、前月比のトラフィック変動は +11.64万（成長率 +48%）です。主要な流入市場はインド（シェア 41.5%）で、月間 21.07万のダイレクト訪問と月間 — のオーガニック検索訪問を含みます。

OpenAI.fm は無料ですか？料金モデルは何ですか？

OpenAI.fm は無料の料金モデルで運営されています。Free to use in the browser with no account required. Costs only apply if you separately call OpenAI's text-to-speech API and pay its per-character audio pricing. 対応する請求・チェックアウトプラットフォームには未掲載が含まれます。

OpenAI.fm — 月間訪問数 (35.9万/月)・料金・API・代替ツール比較

Open AI Tools

OpenAI.fm — 月間訪問数 (35.9万/月)・料金・API・代替ツール比較 | Open AI Tools

OpenAI.fm について

Multiple voice presets

Pick from a roster of built-in voices ranging from bright and conversational to calm and narration-friendly, then hear the same line delivered differently.

Style instructions from plain text

Add a short natural-language direction such as "speak slowly and warmly" to influence tone, pace, and emotion without changing the script itself.

Instant browser playback

Paste a paragraph or a full script and stream the synthesized audio immediately, with no signup, install, or configuration step.

Side-by-side auditioning

Switch voices, styles, and wording back-to-back to judge which combination fits a voiceover, audiobook, or product demo.

Direct line to the API

The demo mirrors the same speech generation models exposed through OpenAI's TTS endpoints, so what you hear is a good preview of what an integration will produce.

Soundwave player

A soundwave visualization animates while audio plays, and there is a compact embedded player for listening without leaving the page.

OpenAI.fm is a browser-based playground that showcases the speech generation models behind OpenAI's text-to-speech API. Type or paste text, optionally steer the delivery with an inline instruction, and hear the result spoken aloud by a selectable voice. It is a quick way to compare voices and styles before you commit to an API integration.

OpenAI.fm の効果的なユースケース

Voiceover creators

Cast the right voice for a script

Paste lines of dialogue with short style cues and audition several voices to find the right narrator for a script, audiobook sample, or podcast intro.

Language learners

Practice pronunciation with a reference read

Generate an English reference read of a line to hear natural pacing and intonation before you invest time in recording or hiring talent.

Developers

Prototype before integrating the API

Test a style prompt and a voice choice in the browser first, then replicate the same settings in code when calling OpenAI's TTS endpoint.

Product marketers

Rapid copy sanity check

Turn a product announcement or feature blurb into a spoken preview in seconds, so stakeholders can hear the copy rather than read it.

OpenAI.fm の代替ツール・競合トップ 12 件

同じ主要カテゴリの競合 AI ツールをテレメトリで並列比較

OpenAI.fm の代替ツールをすべて見る →AI テキスト読み上げのツールをすべて見る →

順位	AI ツール	月間訪問数	前月比成長率	直接流入の割合	料金	直接比較
●	OpenAI.fm	35.9万	+48%	直接流入 59%	無料	表示中
1	ElevenLabs 圧倒的に優れた音声クローンと感情表現の幅を提供しますが、OpenAI固有の音声プレビューのレイアウトはありません。	4239.68万	+26.1%	直接流入 44%	フリーミアム、有料、料金は要問い合わせ	vs ElevenLabs
2	Fish Audio インスタント音声クローンを備えたオープンソースのスタジオ品質テキスト読み上げ機能を提供しますが、セルフホストまたはコミュニティ製Webインターフェースが必要です。	855.72万	+1.6%	直接流入 43%	フリーミアム	vs Fish Audio
3	F5 TTS 表現力豊かなニューラル音声合成用の軽量なオープンソース型プレイグラウンドですが、商業用の制作機能はやや少なめです。	5789	-29.3%	直接流入 40%	無料	vs F5 TTS
4	Speechify 純粋な音声生成のテストよりも、デジタル文書の読み上げやリスニング支援に大きく重点を置いています。	545.75万	+0.5%	直接流入 52%	フリーミアム	vs Speechify
5	TTSMaker シンプルな無料のオンライン音声変換ツールですが、音声スタイルやパラメータの細かい調整機能はやや劣ります。	115.88万	+6.8%	直接流入 44%	フリーミアム	vs TTSMaker
6	ttsMP3.com 貼り付けたテキストを素早くダウンロード可能なMP3に変換しますが、高度なAI音声デザインや感情制御が不足しています。	37.89万	+8.1%	直接流入 44%	フリーミアム	vs ttsMP3.com