Jakjitech pack maker
Flats
Automatic front & back flats
Line drawings that follow the item and details, with measurement codes (A, B, C…) marked in red and linked to the size spec.
How it works
Everything a factory needs for a sample, in four steps.
Choose sizes
Pick the sizes you need and a base (sample) size. Sizes follow Korean labels — men 80–110, women 44–88 — with letter sizes shown alongside.
Choose & refine details
Choose a style (e.g. tennis skirt), neckline and pockets. In the Edit flats tab, drag handles to adjust proportions and add notes or arrows. Have a photo? The Photo analysis tab can identify the item.
Get production-ready
Check for missing items, calculate cost and margin, build a color × size order sheet, draft care label text and log sample fittings.
Save & send
Correct the numbers to your sample's measurements, then print to PDF, export Excel (CSV), keep it in ‘My styles’ or send a share link to your factory.
A tech pack a factory can read
Laid out the way garment workshops in Seoul's Dongdaemun district expect it.
Size spec
Graded measurements for every size
Base values and grade rules fill in all sizes, with oversized/slim adjustments and waist inches for bottoms.
Sewing
Sewing spec in workshop terms
Default construction notes — overlock, 2-needle, coverstitch, rib — in words factories understand.
Fabric
Fabric & trims table
Choose jersey, French terry, denim, oxford and more to fill composition and weight; a trims list is prepared for each item.
Pattern
Pattern drafting (beta), full-size print
Drafts pattern pieces for all 34 styles from your tech pack measurements, including collars, closures, yokes and pleats. Prints full size on tiled A4 or one large sheet.
Production
Production checks
Finds the blanks a factory will ask about, and calculates cost per piece, margin and order quantities. Includes care label text (Korean rules) and a sample fit log.
Share
My styles & share links
Save and duplicate styles, and send one link to your factory or phone. Recipients view and print read-only without an account; cost data is left out by default.
Privacy
Recognition stays on your device
Item, detail and color recognition runs free inside your browser. Photos are never sent to our server or to an AI company.
Who it's for
People making clothes without a pattern room or production manager, and people learning how the industry works.
Indie brands · own-label shops
Get the first sample right
Show a factory a photo and say "something like this", and samples come back again and again. Agree on numbers and drawings instead, and revisions drop.
- Pick sizes, a style and details
- Correct the size spec to your sample (how to measure)
- Check fabric, trims and sewing spec (terms)
- Use the Production tab for missing items, cost, order quantities and care label, then send PDF and Excel
- ‘Save file’ so you can reuse it next season
Fashion & apparel students
Practice the real format
Organize what you learned about flats, measuring and sewing terms into the tech pack format used in production.
- Choose items and see how the flats change with details
- Match size spec codes (A, B, C) with the flats to learn measuring points
- See how measurements turn into pattern pieces in the Pattern tab (beta)
- Save as PDF or flat-sketch SVG for assignments and portfolios
- Review terms and steps in the how-to guide
FAQ
Common questions before you start.
Is it really free? Do I need an account?
Yes, it's free and needs no sign-up. Print the tech pack or save it as PDF or HTML.
Can I send the size spec numbers to a factory as they are?
No. The size spec uses regular-fit reference values for each item. Measure your sample, click the numbers in the table to correct them, and then send it.
Where is my garment photo stored?
Your photo is processed only inside your browser and is never stored on our server. Photo recognition also runs on your device, so the photo never leaves it.
Which sizes does it use?
Korean size labels: men 80–110 (about XXS–XXL) and women 44–88 (about XS–XL). In the English view each size also shows its letter size, and bottoms can show waist inches. You can rename sizes and type your own measurements on the tech pack.
Which garments can I make?
34 styles in 6 categories (tops, outerwear, pants, skirts, dresses, accessories), e.g. cropped tee, polo, sleeveless, zip-up hoodie, blouson, denim jacket, wide pants, slacks, jeans, joggers, cargo pants, A-line, pleated, tennis, mermaid and wrap skirts, shirt dress and a zipper pouch.
Can it draft patterns?
Yes, in beta. For all 34 styles it drafts front, back, sleeve, collar, hood and other pieces from the base-size measurements, including style-specific shapes like polo collars, cardigan bands, zip-up fronts, jeans yokes, slacks pleats, elastic jogger waists, pleated and wrap skirts. It shows seam allowances, folds, notches and grainlines and prints full size on tiled A4 or one large sheet. It hasn't been verified by real cutting yet — always make a test garment first.
Can I save several styles and send a link to a factory?
Yes. ‘My styles’ keeps multiple styles (with photos) in your browser. ‘Share link’ packs the tech pack into a link the recipient can open read-only and print, without an account. Photos are never included, and cost/margin only if you choose.
Is the tech pack in English?
When you use the English view, the tech pack — labels, sewing spec, notes and size spec — is printed and saved in English. Switch to Korean at any time to produce the same tech pack in Korean for a Korean factory.
Your first tech pack in 5 minutes
No photo needed — just pick a garment and start.
Please use Jakji for your own designs and samples. Copying the shape of another company's product can be illegal (in Korea, under the Unfair Competition Prevention Act).