botnick/Netra-Thai-Accounting-Synth

Netra Thai Accounting Synth

Rendered images of synthetic Thai accounting documents, each with two labels that come from the same draw as the image:

• ocr_text: the full page text as Markdown (tables as HTML), in reading order, exactly as printed.
• kie: a JSON object of accounting fields (parties, tax IDs, dates, line items, VAT, withholding tax, totals, payment details).

Every company, person, address, tax ID, account number, phone number and amount was generated at random. No real document was scanned, photographed or transcribed to make this dataset.

12,189 images in three configs:

Config	Images	What it is
forms	4,989	A4 ใบแจ้งหนี้ invoice, ใบเสนอราคา quotation, ใบเสร็จรับเงิน receipt, ใบสำคัญจ่าย payment voucher
accounting	4,800	A4 tax invoices, credit/debit notes, billing notes and 50 ทวิ withholding-tax certificates; 80 mm POS slips (abbreviated tax invoices); mobile-banking transfer slips
photos	2,400	Tax invoices and POS slips from the accounting generator, turned into phone-photo-like JPEGs

The dataset was made to train and evaluate Netra-2B, a Thai accounting-document reader.

Contents: Samples · Quick start · Examples · Configs and counts · Fields · How it was made · Intended use · Privacy · Attribution and licence · Relation to Netra-2B · Citation

สรุปภาษาไทย

ชุดข้อมูลภาพเอกสารบัญชีภาษาไทย สังเคราะห์ทั้งหมด 12,189 ภาพ (ใบแจ้งหนี้ ใบเสนอราคา ใบเสร็จรับเงิน ใบสำคัญจ่าย ใบกำกับภาษีเต็มรูป/อย่างย่อ ใบลดหนี้/ใบเพิ่มหนี้ ใบวางบิล หนังสือรับรองการหักภาษี ณ ที่จ่าย (50 ทวิ) และสลิปโอนเงิน) แต่ละภาพมีข้อความเฉลยแบบ Markdown และข้อมูลสำคัญแบบ JSON (KIE) ที่สร้างพร้อมภาพจากชุดค่าเดียวกัน ตัวเลขทุกจุดผ่านการตรวจเลขคณิต (จำนวน × ราคา, ยอดรวม, VAT 7%, ภาษีหัก ณ ที่จ่าย, จำนวนเงินตัวอักษร)

ชื่อบุคคล ชื่อบริษัท เลขประจำตัวผู้เสียภาษี เลขบัญชี เบอร์โทร และพร้อมเพย์ทั้งหมดสุ่มขึ้น ไม่ได้มาจากเอกสารจริง แต่การสุ่มอาจบังเอิญตรงกับบุคคลหรือนิติบุคคลจริงได้ ห้ามใช้ชุดข้อมูลนี้เพื่อระบุตัวบุคคลหรือติดต่อใคร ใช้สำหรับเทรนและทดสอบโมเดล OCR/KIE เอกสารไทยเท่านั้น คะแนนบนชุดนี้ไม่ใช่ตัววัดความแม่นยำบนเอกสารจริง สัญญาอนุญาต CC BY-SA 4.0

Samples

One validation image per doc_type, as stored in the dataset (photos keep their background, angle and noise).

Quick start

import json
from datasets import load_dataset

ds = load_dataset("botnick/Netra-Thai-Accounting-Synth", "accounting", split="validation")

row = ds[0]
row["image"]                      # PIL image
print(row["id"], row["doc_type"])
print(row["ocr_text"][:300])      # page text as Markdown

kie = json.loads(row["kie"])      # kie is stored as a JSON string
print(kie["doc_type"], kie["date"], kie["total"])
for item in kie["items"]:
    print(item["desc"], item["amount"])

Configs: forms (default), accounting, photos. Splits: train, validation. To keep one document type, filter on the doc_type column:

slips = ds.filter(lambda r: r["doc_type"] == "transfer_slip")

Examples

Each figure shows a validation image next to its labels. The text and JSON in the figures are copied from the row; long lines are shortened with ….

Tax invoice (accounting). The Buddhist-era date 11-11-2568 becomes "2025-11-11", amounts become JSON numbers, the buyer's branch "(สาขาที่ 00004)" becomes "00004" and the seller's head office "00000".

Transfer slip (accounting). Masked names and account numbers stay masked as printed; the bank code BAY is expanded to the full Thai bank name; fields the slip does not have are null.

Phone photo (photos). The labels are those of the clean render, whatever the angle, light, blur and JPEG noise.

The row behind the transfer-slip figure, synth2/transfer_slip_00050 (config accounting, split validation):

ocr_text

# ทำรายการสำเร็จ

18 เม.ย. 69 13:59 น.

BAY
น.ส. โศภิตา สรxxx
BAY
xxx-xxx838-4

RK
บริษัท โรงงานนันทริกา บิวตี้ จำกัด
Biller ID: 021540928422247

จำนวน: 4,200.00 บาท
ค่าธรรมเนียม: 0.00 บาท
Ref 1 85284386
เลขที่อ้างอิง 840948077437CTF03941

kie, after json.loads, pretty-printed

{
  "doc_type": "transfer_slip",
  "doc_title": "ทำรายการสำเร็จ",
  "doc_no": "840948077437CTF03941",
  "book_no": null,
  "date": "2026-04-18",
  "time": "13:59",
  "due_date": null,
  "seller": null,
  "buyer": null,
  "payer": {
    "name": "น.ส. โศภิตา สรxxx",
    "tax_id": null,
    "branch": null,
    "address": null,
    "phone": null
  },
  "payee": {
    "name": "บริษัท โรงงานนันทริกา บิวตี้ จำกัด",
    "tax_id": null,
    "branch": null,
    "address": null,
    "phone": null
  },
  "items": [],
  "subtotal": null,
  "discount": null,
  "vat_base": null,
  "vat_rate": null,
  "vat": null,
  "vat_included": null,
  "wht_rate": null,
  "wht": null,
  "total": 4200,
  "net_paid": 4200,
  "amount_in_words": null,
  "currency": "THB",
  "ref_doc_no": null,
  "ref_date": null,
  "payment": {
    "method": "bill_payment",
    "from_bank": "ธนาคารกรุงศรีอยุธยา",
    "from_bank_code": "BAY",
    "from_account": "xxx-xxx838-4",
    "to_bank": null,
    "to_bank_code": null,
    "to_account": null,
    "promptpay_id": null,
    "promptpay_type": null,
    "biller_id": "021540928422247",
    "ref1": "85284386",
    "ref2": null,
    "fee": 0,
    "memo": null
  },
  "extra": null
}

Configs and counts

Rows per doc_type. The splits are the ones the generators wrote; validation documents never appear in train.

forms

doc_type	train	validation
invoice	1,172	75
quotation	1,172	75
receipt	1,171	75
payment_voucher	1,174	75
total	4,689	300

A4 pages, PNG, 1191 × 1685 px (1.5× A4 at 96 dpi; augmented images can be smaller). Every row has a kie label. The 11 missing documents (out of 5,000 drawn) failed the generator's checks and were not written. These forms keep the footer line แบบฟอร์มจาก bilbo-app.com of the templates they were ported from; it is printed on the page and is part of ocr_text.

accounting

doc_type	kie doc_type	train	validation
tax_invoice	tax_invoice	750	50
abbr_tax_invoice	abbreviated_tax_invoice	750	50
credit_debit_note	credit_note / debit_note	750 (448 / 302)	50 (33 / 17)
billing_note	billing_note	750	50
wht_cert	wht_certificate	750	50
transfer_slip	transfer_slip	750	50
total		4,500	300

PNG. A4 types are 1191 × 1685 px; POS slips are 755 px wide and transfer slips 760 px wide, with the height of their content.

photos

doc_type	train	validation
tax_invoice	1,141	59
abbr_tax_invoice	1,142	58
total	2,283	117

JPEG. In this config 70% of full tax invoices print VAT-inclusive prices (15% in accounting): 828 of the 1,200 tax invoices. Validation is a random 5% drawn by document.

Fields

Field	Type	Content
image	Image	the rendered page (PNG, or JPEG for photos), bytes embedded
id	string	<source_set>/<doc_type>_<seed>, unique across the dataset
doc_type	string	generator type, as in the tables above
ocr_text	string	page text as Markdown (see below)
kie	string or null	JSON object (see below). Parse with json.loads. Set on every row of this release
source_set	string	synth (forms), synth2 (accounting) or synth3 (photos)

Loading code is in Quick start; a complete row is shown under Examples.

ocr_text

The output format of Typhoon OCR 1.5:

• Markdown. The document title is # <title>. Blocks are separated by a blank line, one field per line as <printed label> <value>.
• Reading order: title first, then for each horizontal band the left column top to bottom, then the right column.
• Tables are HTML: <table>, a header <tr> of <th>, one <tr> of <td> per printed row (empty numbered rows included).
• Checkboxes are ☑ (ticked) and ☐, followed by the option text on the same line.
• Text is exactly as printed: Thai digits stay Thai digits, money keeps its commas, a dashed tax ID stays dashed. Tax IDs printed in per-digit boxes become the plain 13 digits. A field that wraps in the image is one line.
• The logo is a coloured shape. A monogram on it is a plain line in the label. Decorative shapes, QR codes, the slip check mark and arrows are not labelled.

kie

Every KIE object has all of these keys. The value is null when the field does not exist on that document.

key	type	meaning
doc_type	str	invoice, quotation, receipt, payment_voucher, tax_invoice, abbreviated_tax_invoice, credit_note, debit_note, billing_note, wht_certificate, transfer_slip
doc_title	str	the printed title, plus the English subtitle when one is printed
doc_no	str	document number. For a transfer slip, the transaction reference
book_no	str	เล่มที่ (receipt, 50 ทวิ)
date	yyyy-mm-dd	document date, Gregorian (converted from พ.ศ.)
time	HH:MM[:SS]	POS slip, transfer slip
due_date	yyyy-mm-dd	due date. For a billing note, the appointment date for payment
seller, buyer, payer, payee	party	sales documents use seller/buyer; the voucher, 50 ทวิ and slips use payer/payee
items	list	line items, [] when there are none
subtotal	number	sum of the printed line amounts
discount	number	0 when none
vat_base	number	amount VAT is computed on (excludes VAT)
vat_rate	number	percent: 7, or 0 when no VAT is charged
vat	number	VAT amount
vat_included	bool	true when line prices already include VAT
wht_rate	number	percent (1, 2, 3, 5, 10, 15); null when several rates are mixed
wht	number	withholding-tax amount
total	number	grand total including VAT, before WHT. For 50 ทวิ, the total income paid
net_paid	number	amount actually paid (total − WHT)
amount_in_words	str	the Thai baht text, without parentheses
currency	str	always "THB"
ref_doc_no, ref_date	str, date	the original tax invoice a credit/debit note refers to
payment	object	method and details (below)
extra	object	type-specific fields (below)

party: {"name", "tax_id", "branch", "address", "phone"}. tax_id is 13 digits without dashes. branch is the 5-digit Revenue Department branch code: "00000" for สำนักงานใหญ่ / Head Office, "00007" for สาขาที่ 7, null when no branch is printed.

items:

• Sales documents, POS slips, credit/debit notes: {"desc", "qty", "unit", "unit_price", "amount"}. unit is null when there is no unit column. On POS slips unit_price is set only when the slip prints it.
• Billing note: {"doc_no", "date", "due_date", "desc", "amount"}, one item per invoice listed.
• Payment voucher: {"desc", "qty": null, "unit": null, "unit_price": null, "amount"}.

payment:

• Tax invoice, receipt: {"method": "cash"|"transfer"|"cheque", "cheque": {"bank", "no", "date"}|null}, or a transfer box {"method": "transfer", "bank", "account_name", "account_no"}.
• POS slip: {"method": "cash"|"card"|"qr"|"wallet", "received", "change", "card_no"}.
• Transfer slip: {"method": "transfer"|"promptpay"|"bill_payment", "from_bank", "from_bank_code", "from_account", "to_bank", "to_bank_code", "to_account", "promptpay_id", "promptpay_type", "biller_id", "ref1", "ref2", "fee", "memo"}. Bank names are the full Thai names even when the slip shows only a code. Accounts, names and PromptPay IDs stay masked exactly as printed (xxx-x-x1234-x, นาย สมชาย ใ***).

extra:

• tax_invoice: po_no, salesperson, copy, note
• credit/debit note: adjustment ("credit"|"debit"), reason, original_value, correct_value, difference, copy, note
• billing_note: count, credit_days
• abbreviated_tax_invoice: pos_no, cashier, table
• wht_certificate: form (ภ.ง.ด.1ก / 1ก พิเศษ / 2 / 3 / 2ก / 3ก / 53), seq_no, payer_condition, payer_condition_other, income: [{"type", "spec", "date_paid", "tax_year", "amount", "tax", "rate"}], funds: {"gpf", "sso", "pvf"}, signer. For 50 ทวิ, amount_in_words is the tax withheld.
• invoice: note, payment_appointment_date. quotation: note, valid_until, contact, deposit_percent, deposit, balance_due_when, delivery. receipt: receiver_name, receiver_sign_date. payment_voucher: attachments.

Normalisation: all digits in KIE strings are Arabic, even where the page prints Thai digits; whitespace is collapsed. Numbers are JSON numbers (int when whole, else at most 2 decimals). A money field printed blank or - is 0. Dates are ISO Gregorian; two-digit พ.ศ. years are read as 25yy.

How it was made

1. Draw. A Python generator draws one view per document from a seeded random.Random (seed = document number, so a rerun gives the same data): issuer and customer, address, tax ID, dates, 1-15 line items, discount, VAT, withholding, payment method, notes, numeral style, colour theme and font. The HTML page, the Markdown label and the KIE label are all built from that one view.

2. Verify. Before a document is written, the arithmetic is checked again independently: qty × price per line, subtotal, discount, VAT 7% (exclusive and VAT-inclusive 7/107), withholding, net, deposit, credit/debit differences, 50 ทวิ row sums and rates, POS change, and the Thai baht words. For accounting, every KIE amount, document number, party name, tax ID and branch code must also appear in the OCR label. A mismatch drops the document. The KIE labels for forms were produced later by redrawing each form from its seed and requiring an exact match with the stored OCR label.

3. Render. Headless Chrome prints the page. A probe checks that the page fits A4 and that no cell or field overflows; otherwise the same content is laid out more compactly, then redrawn with fewer lines.

4. Augment.

   • forms, accounting: about 30% of images get one or more mild effects: rotation 0.2-1.5°, scale 0.80-0.97, Gaussian blur (radius 0.3-0.9), Gaussian noise (σ 2-7), JPEG round-trip at quality 45-85 (stored as PNG).
   • photos: every page is placed on a desk / car-seat / dark background at a perspective angle (tilt up to about 12°), under uneven light with a soft shadow, sometimes with a skin-toned thumb at an edge or a second paper slip over a corner, then camera blur (≤ 1.2 px), sensor noise, a colour cast and JPEG quality 70-90. The page fills 55-85% of the frame. Labels are those of the clean render.

   Augmentation never changes a label.

What varies: company forms (บริษัท … จำกัด, (มหาชน), ห้างหุ้นส่วนจำกัด / หจก., shops, clinics, individuals), Bangkok and provincial address styles, 8 Buddhist-era date styles (dates from 2568 to 2570 B.E., i.e. 2025-2027, so some documents are future-dated), Arabic / mixed / Thai numerals, head-office and branch codes, payment ticks, cheque details, bank and PromptPay boxes, optional fields left blank, 10+ colour themes and Thai fonts, several layouts per type (A4 headers split / centred / banner; slip themes card / list / horizontal with 14 bank colour themes; POS slips in three styles). Bank names and colours resemble real Thai banks, but no bank logo is used: the circles hold Latin initials. The 50 ทวิ table follows the Revenue Department form's rows with 4(ข) collapsed to one row.

Intended use

• Training and evaluating OCR (page-to-Markdown) and key-information extraction for Thai business documents.
• Testing parsers and validators for Thai accounting fields (tax IDs, branch codes, Buddhist-era dates, baht text).

Not suitable as a measure of real-world accuracy. The layouts come from a small set of templates and the images are clean renders or simulated photos, so a model that scores well here can still do much worse on real scans and phone photos. Report results on real documents separately. Not for building systems that identify or profile people.

Privacy

• Every person name is a random pairing of a first name and a family name from public Thai name lists (see Attribution), with a random title. Company names are random combinations of Thai words, a small fixed list of name roots and business descriptors.
• 13-digit tax IDs are random with a valid mod-11 check digit. Bank account numbers, card digits, phone numbers, e-mail addresses (random letter domains), PromptPay IDs, biller IDs and references are random digits or letters.
• Addresses combine real Thai place names (districts, sub-districts, postcodes, road and building names) with random house numbers.
• An automated scan of every ocr_text and kie value found 17,741 13-digit numbers in the page text. 17,710 have a valid check digit; the other 31 are random 13-digit bill-payment references on transfer slips, not IDs. All 17,098 tax_id values in KIE have a valid check digit. No value repeats in more than two places. Every person name in the KIE labels resolves to a first name from the name list, followed by a family name from the list (in full or masked) or by nothing; the remaining name fields are business names built from the generator's word pools.

Because values are random, a name, tax ID, account number or phone number may coincidentally match a real person or company. Thai mobile numbers in particular are densely allocated, so many random ones belong to someone. Do not use this dataset to identify, contact or make decisions about anyone.

Attribution and licence

The dataset (images and labels) is released under CC BY-SA 4.0 (share-alike, because the person names are drawn from the CC BY-SA 4.0 Thai Names Corpus).

• Name lists: Thai first names and family names from the Thai Male and Female Names Corpus by Korkeat Wannapat (https://github.com/korkeatw/thai-names-corpus/, CC BY-SA 4.0), as distributed in the PyThaiNLP corpus. Province names from the PyThaiNLP corpus (CC0 1.0); random business-name words from TNC word frequencies in the PyThaiNLP corpus (CC0 1.0). Individual names are drawn from these lists one at a time; the lists themselves are not redistributed.
• Fonts were used only to render the pages; no font file is included. Noto Sans Thai, Noto Sans, Noto Serif Thai, Noto Looped Thai and Sarabun are under the SIL Open Font License 1.1. The TLWG fonts (Loma, Garuda, Waree, Kinnari, Norasi, Laksaman, Umpush, Tlwg Typo / Mono / Typist / Typewriter) are under GPL-2+ with the font exception.
• Layouts are ported from our own internal document templates. Bank names are used only as names.

Relation to Netra-2B

Netra-2B v0.1 was fine-tuned with data from the generators behind forms and accounting (subsets after per-source caps, alongside third-party data listed on the model card). Its "accounting KIE on synthetic documents" evaluation uses documents from the accounting validation split. The photos config was made afterwards for later experimental rounds and was not part of v0.1's training. Since v0.1, billing-note extra.credit_days is null when the page does not print credit days. Scores on this dataset are in-distribution for Netra-2B.

Citation

@misc{netra_thai_accounting_synth_2026,
  title  = {Netra Thai Accounting Synth: synthetic Thai accounting documents with OCR and KIE labels},
  author = {botnick},
  year   = {2026},
  url    = {https://huggingface.co/datasets/botnick/Netra-Thai-Accounting-Synth}
}