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New capabilities

Fresh in the kit — just landed.

New✅ ValidationCosta Rica ID number validatorEnter 1-0234-0567 and you learn it is a valid personal cédula, stored as 102340567 and shown in its usual hyphenated…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica severance calculatorThirty months on an average ₡600,000, then a dismissal without just cause: the settlement comes to ₡2,040,000 in notice…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica employer payroll charges 2026A ₡1,000,000 monthly salary costs a Costa Rican employer ₡1,268,300 in 2026, because ₡268,300 in social charges, the…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica net salary calculator 2026On ₡1,000,000 gross a month, an employee in Costa Rica takes home ₡883,500 in 2026: ₡108,300 goes to the CCSS and ₡8,200…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica aguinaldo calculatorYour aguinaldo is one twelfth of everything earned from 1 December to 30 November: twelve months at ₡600,000 come to an…NNitroRuns in your browserFreeOpen →New➗ MathNull space calculatorThe rows (1, 2, 3) and (2, 4, 6) have rank 1, so their null space needs two basis vectors: (−2, 1, 0) and (−3, 0, 1).SsamuraiRuns in your browserFreeOpen →New➗ MathLogical NOR calculatorFalse NOR false is true, and every other pair gives false. Enter two true-or-false values and get the NOR result with…PPavilionRuns in your browserFreeOpen →New➗ MathMultiply complex numbersMultiply two complex numbers in rectangular form: (1 + 2i)(3 + 4i) gives −5 + 10i, using (ac − bd) + (ad + bc)i with i²…AabuelaRuns in your browserFreeOpen →New➗ MathMöbius strip calculatorGive the band width and the centreline radius and get the Möbius strip's area and its single edge: a band 1 wide on a…SsamuraiRuns in your browserFreeOpen →New➗ MathLong multiplication calculatorMultiply two whole numbers the schoolbook way and see every partial product: 123 times 45 gives the rows 615 and 4920…AabuelaRuns in your browserFreeOpen →New➗ MathMean calculatorAdd up a list and divide by how many numbers it holds: 2, 4, 6, 8 and 10 sum to 30, so the mean is 6.PPavilionRuns in your browserFreeOpen →New➗ MathLog2 calculatorEnter a positive number and get its base-2 logarithm, the power of two that produces it: log2 of 8 is 3, of one half is…SsamuraiRuns in your browserFreeOpen →

Popular capabilities

Most viewed first; free tools win ties.

#1📈 SEOValidate a redirect mapCatch redirect mistakes while the map is still a file: in /a → /b → /c → /d, the route from /a takes three hops and is…GGalaRuns in your browserFreeOpen →#2📄 Documents & PDFConvert HTML to PDFTurn an invoice template or a rendered report written in HTML into a PDF that looks exactly like the page a modern…NNitroAPI$0.040Open →#3📄 Documents & PDFJPG to PDFThree photos of a damaged part, or several receipts snapped on a phone, become one PDF with one page per image, in the…NNitroAPI$0.002Open →#4📄 Documents & PDFURL to PDFKeep a competitor's advertised claims, a government notice or a partner's terms exactly as they appeared on a given…NNitroAPI$0.040Open →#5🌐 TranslationSort a list alphabeticallyWith Spanish rules, “nandu” comes before “ñandú” and “Ñoño”, and “Ángel” sits right after “angel” instead of at the end…GGalaRuns in your browserFreeOpen →#6✅ ValidationValidate a phone numberType +34 600 11 12 22 and you get +34600111222, confirmed as a valid Spanish number of 11 digits, ready for your contact…NNitroRuns in your browserFreeOpen →#7✅ ValidationColor contrast checkerKnow whether text will stay readable for everyone, whatever your own screen shows: dark gray #111827 on white has a…GGalaRuns in your browserFreeOpen →#8🖼️ ImagesAdd a logo to a QR codeAdd your logo to the center of a QR code without breaking it: the error-correction level, the logo's size and the blank…NNitroRuns in your browserFreeOpen →#9🕸️ Web Scraping & MonitoringRemove tracking parameters from a URLTwo UTM tags gone, the id parameter kept and nothing else in the link touched: paste a link to strip known tracking…GGalaRuns in your browserFreeOpen →#10📄 Documents & PDFSplit a PDFCut a three-page PDF every two pages and you get two files: pages 1 and 2, then page 3.NNitroAPI$0.002Open →#11📄 Documents & PDFExtract text from a PDFGet the words a native PDF already contains as plain text in reading order, without fonts, columns or coordinates…NNitroAPI$0.002Open →#12✍️ Text & AISummarize a textNobody on your team has to skim a 4,000-word document again to find the three sentences that matter: paste it in and get…NNitroAPI$0.003Open →

Find your tool

Search in your own words or filter by category.

🎧 Audio & VoiceAPI
Transcript with timestamps
Every word in the transcript comes with a start and end time in seconds, so a search result, a caption highlight or a video cut lands on the exact moment a…
NNitro
$0.002
🎧 Audio & VoiceAPI
Subtitles as .srt
Send an audio track and get back a numbered .srt file whose lines break at natural pauses and appear in step with speech, ready for any video editor.
NNitro
$0.002
🎧 Audio & VoiceAPI
WebVTT captions
Send an audio track and get back a .vtt file with the WEBVTT header, timed cues and readable lines, ready to link from the track element of an HTML5 video.
NNitro
$0.002
🎧 Audio & VoiceAPI
Identify speakers
Turn a two-person interview or call into alternating turns labeled Speaker 1 and Speaker 2, each with its text and its start and end time.
NNitro
$0.002
🎧 Audio & VoiceAPI
Detect the spoken language
Find out which language a recording is in without transcribing a single word, even on very short or noisy clips.
NNitro
$0.002
🎧 Audio & VoiceAPI
Translate audio
Send a recording in one language and get back text in another in one job, with no separate transcription step whose mistakes would carry into the translation.
NNitro
$0.004
🎧 Audio & VoiceAPI
Summarize audio
Skip the 60-minute replay: send the recording and get back a written summary that follows how the talk actually went, from a lecture's arc to an interview's…
NNitro
$0.004
🎧 Audio & VoiceAPI
Meeting minutes
Turn a recorded meeting into minutes organized around decisions, owners and next steps that anyone can scan in under a minute.
NNitro
$0.004
🎧 Audio & VoiceAPI
Action items
When someone says 'I'll circle back on that', it comes back as a commitment, tied to that speaker when the recording makes it clear.
NNitro
$0.004
🎧 Audio & VoiceAPI
Podcast chapters
Send an episode and get back a list of chapters, each with a short title and its start time in seconds, placed where the conversation actually changes topic.
NNitro
$0.004
🎧 Audio & VoiceAPI
Show notes
Upload the episode audio and get back a short summary, the key discussion points in order and a handful of quotes to highlight, ready for your podcast…
NNitro
$0.004
🎧 Audio & VoiceAPI
Keywords from audio
Get a ranked list of the keywords and topics actually discussed in a recording, so you know what is inside before you listen.
NNitro
$0.004
🎧 Audio & VoiceAPI
Audio to a blog post
Send a recording and get back an article draft with headings, paragraph breaks and a coherent flow, where false starts and filler words have been smoothed into…
NNitro
$0.004
🎧 Audio & VoiceAPI
Moderate spoken audio
Check a voice message, call recording or podcast episode for harassment, threats or hate speech before it goes live, and see what was flagged and roughly where.
NNitro
$0.004
🎧 Audio & VoiceAPI
Clean up a transcript
Turn the raw auto-transcript of a 45-minute episode into clean, punctuated paragraphs: fillers like 'um', repeated words and false starts go, while every…
NNitro
$0.003
🎧 Audio & VoiceAPI
Search words in audio
Give it a recording and a list of words, and it returns every mention with its exact timestamp, so a reviewer listens to the seconds that matter instead of the…
NNitro
$0.002
🎧 Audio & VoiceAPI
Text to speech
Send a text and get natural, well-paced narration back, with a download link that stays valid for 24 hours.
NNitro
$0.005
🎧 Audio & VoiceAPI
SSML text to speech
Your SSML is accepted as is and read aloud naturally, but know the limit: a two-second break tag does not hold for two seconds, and emphasis tags do not stress…
NNitro
$0.002
🎧 Audio & VoiceAPI
Spanish text to speech
Native Spanish voices read your text the way a Spanish narrator would: decimal commas, local currency and day-month-year dates sound natural instead of…
NNitro
$0.002
🎧 Audio & VoiceSoon
Convert audio
Turn a phone voice memo in M4A into an MP3, or WAV session files into FLAC, so the next player, upload form or archive accepts the file.
NNitro
$0.077
🎧 Audio & VoiceSoon
Trim audio
Pull the thirty seconds that matter out of a forty-minute recording: give a start point and how many seconds to keep, and only that clip comes back, cut cleanly…
NNitro
$0.077
🎧 Audio & VoiceSoon
Normalize loudness
Bring every episode, chapter or voice clip to the same -16 LUFS loudness, so listeners stop reaching for the volume knob between files.
NNitro
$0.077
🎧 Audio & VoiceSoon
Remove silence
A ninety-second dead spot is cut, while a half-second breath between sentences stays put. Upload a podcast, interview or voice memo and get back a tighter file…
NNitro
$0.077
🎧 Audio & VoiceSoon
Reduce audio noise
Fan rumble, laptop hiss and the hum of old wiring are pulled down while the voice on top stays intact, because steady noise is told apart from speech.
NNitro
$0.077
🎧 Audio & VoiceSoon
Merge audio
Join an intro jingle, a recorded interview and an outro sponsor read into one publish-ready episode file, in the order you list them.
NNitro
$0.077
🎧 Audio & VoiceSoon
Split audio
Turn a ninety-minute recording into the pieces you need: chapters at exact timestamps, a two-minute teaser, or equal segments of a fixed length, each delivered…
NNitro
$0.077
🎧 Audio & VoiceSoon
Audio metadata
Read the ID3 tags already inside an MP3, or write a new title, artist, album, track number or cover art, so podcast apps and music players stop showing 'Track…
NNitro
$0.077
🎧 Audio & VoiceSoon
Waveform image
Send an audio file and get back a finished waveform image or the peaks data behind it, so your player shows the loud moments instead of a blank progress bar.
NNitro
$0.077
🎬 VideoSoon
Transcribe a video
Get the spoken words of a video back as text with timestamps, so an hour of webinar, interview or demo becomes searchable and quotable without an afternoon of…
NNitro
$0.079
🎬 VideoSoon
Add subtitles to a video
Send a video and get back a timed subtitle file transcribed from its spoken audio, whether it is a two-minute clip or a two-hour lecture.
NNitro
$0.079
🎬 VideoSoon
Burn subtitles into a video
Send a video and its SRT captions, and each cue is painted onto the frames at the right time, giving one file whose captions survive social apps, kiosk screens…
NNitro
$0.077
🎬 VideoSoon
Get the audio from a video
An interview filmed on camera becomes a separate audio file, ready for a podcast episode, a transcript or a dubbing project.
NNitro
$0.077
🎬 VideoSoon
Convert a video
Turn camera MOV footage into MP4 for the web, or older AVI recordings into MKV or MP4 for modern editing: the content stays the same while the container, and…
NNitro
$0.077
🎬 VideoSoon
Compress a video
Camera footage recorded at capture-quality bitrates is re-encoded with H.264, dropping detail a viewer is unlikely to notice so the file loads fast and stays…
NNitro
$0.077
🎬 VideoSoon
Trim a video
Shave the countdown, the trailing silence and the warm-up take off a recording by giving a start point in seconds and how long to keep from there, with the…
NNitro
$0.077
🎬 VideoSoon
Grab a video thumbnail
Pull a still frame from the exact second you name and use it as the poster image, so your video stops greeting viewers with a black box or a blurry…
NNitro
$0.077
🎬 VideoSoon
Turn a video into a GIF
Pick a start point and a few seconds of a clip and get back a looping GIF already trimmed, frame-rate capped and palette-tuned for the 256-colour limit, so it…
NNitro
$0.077
🎬 VideoSoon
Resize a video
Turn one 4K master into a 1080p or 720p copy that a mobile feed or slow connection can actually play, with the width following the original shape.
NNitro
$0.077
🎬 VideoSoon
Add a watermark to a video
Burn your logo into every frame of a video, in any of the four corners, so the mark that names you as the source travels with the file wherever it is…
NNitro
$0.077
🎬 VideoSoon
Extract frames from a video
Sample one frame every 10 seconds for thumbnail candidates, or one every 0.5 seconds for a labeled training set, and each still comes back as its own image…
NNitro
$0.077
🎬 VideoSoon
Read a video's metadata
Send a link to a video and get back its duration, container, video and audio codecs, resolution, frame rate and the bitrate of each stream, probed from the…
NNitro
$0.077
🎬 VideoSoon
Make a video vertical
Turn a 16:9 landscape video into a 9:16 vertical cut of 1080 by 1920, with the frame following the subject as it moves instead of slicing off faces, products or…
NNitro
$0.077
🎬 VideoSoon
Merge videos
Send an intro, the new episode and an outro in that order and get back one continuous video with all three pieces end to end, exactly as listed.
NNitro
$0.077
🎬 VideoSoon
Summarise a video
Understand an hour-long meeting, lecture or interview in the time it takes to read a page: the summary draws on both what is said and what is shown, and keeps…
NNitro
$0.084
✍️ Text & AIAPI
Summarize a text
Nobody on your team has to skim a 4,000-word document again to find the three sentences that matter: paste it in and get back the substance without the padding…
NNitro
$0.003
✍️ Text & AIAPI
Summarize in bullet points
A long customer review comes back as three or four points a product team can act on without reading the whole thing.
NNitro
$0.003
✍️ Text & AIAPI
Executive summary
Condense a 30-page contract or a full quarterly report into what an executive needs before signing off: the decision, the figures that justify it and the risks…
NNitro
$0.003
✍️ Text & AIAPI
TL;DR
One accurate sentence that tells a reader whether the rest is worth their time: a long email becomes its subject line, an article becomes the single line that…
NNitro
$0.003
✍️ Text & AIAPI
Summarize a web page
Give it a link and it does the four steps for you: it fetches the page, strips the menus and ads, isolates the article body and summarizes what is left.
NNitro
$0.046
✍️ Text & AIAPI
Expand text
Give it three bullet points and get back a paragraph that reads like someone actually wrote it, with the transitions filled in and your order kept.
NNitro
$0.003
✍️ Text & AIAPI
Shorten text
A product description fighting a 160-character limit, or a paragraph that says in five sentences what it could say in two: the tool cuts the padding, keeps the…
NNitro
$0.003
✍️ Text & AIAPI
Rewrite text
Keep the message, change the delivery: a technical product description comes back in plain words for a less specialized audience, with every fact intact, or a…
NNitro
$0.003
✍️ Text & AIAPI
Paraphrase
Send a passage and get it back restated sentence by sentence: the same claims and roughly the same length, with different words and sentence construction.
NNitro
$0.003
✍️ Text & AIAPI
Simplify text
A dense terms-of-service clause comes back as short sentences in everyday words, with every instruction and condition still there, ready to sit next to the…
NNitro
$0.003
✍️ Text & AIAPI
Adjust reading level
Turn one master text into versions for every reader: pick a CEFR level from A1 to C2 and the passage is rebuilt at that level, with simpler or richer vocabulary…
NNitro
$0.003
✍️ Text & AIAPI
Change the tone
Turn a formal changelog entry into a benefit-led newsletter paragraph, or a terse internal answer into a warm reply for an upset customer.
NNitro
$0.003
✍️ Text & AIAPI
Make text formal
Paste a quick internal note and get the client-ready version: contractions expanded, slang replaced with precise terms, run-on sentences made clear, while…
NNitro
$0.003
✍️ Text & AIAPI
Make text sound human
Paste text that is correct but stiff, over-hedged or repetitive and get back the same content with varied sentence rhythm, natural transitions and less filler…
NNitro
$0.003
✍️ Text & AIAPI
Check grammar
Run a text through it and the objective mistakes go, such as subject-verb mismatches, wrong tenses and misplaced commas, in more than 30 languages, while your…
NNitro
$0.003
✍️ Text & AIAPI
Check spelling
A product title that says «recieve» gets flagged with its exact position and ranked corrections, while brand names and slang are weighed before being called…
NNitro
$0.003

How it works

1

Get your key

Create an account with your email and add balance when you need it. No subscription, no sales call.

2

Call the endpoint

One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.

3

Collect the result

Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.

Pay only for what you use

No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.

Free tools
$0.00

On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.

Balance
$10.00+

Top up your balance and spend it across web, API and the app. It never expires.